Medical Cannabis for IBD: Crohn’s and Ulcerative Colitis
People with inflammatory bowel disease (IBD), Crohn’s disease and ulcerative colitis, often say medical cannabis eases their pain, helps them sleep, brings back appetite and takes the edge off anxiety. Studies back some of that as patient experience, but none shows that cannabis heals the inflamed gut or keeps IBD in remission. THC and CBD in any form, smoked, vaped, eaten or taken as drops, are processed by the liver and can affect how IBD medicines such as immunosuppressants are handled, so the decision belongs in a conversation with a physician.
Built on peer-reviewed research published from 2005 to 2026: pooled trials, patient surveys, cohort studies and laboratory work
When IBD runs your day: flares, urgency, pain and sleep
On paper, IBD is inflammation of the digestive tract. In real life it is a calendar built around bathrooms, a bag packed with spare clothes, and plans canceled at the last minute. Flares come and go, and even in a quiet stretch many people never fully trust their gut again.
Knowing where every bathroom is
Urgency, the sudden, can’t-wait need to go, shapes more lives than the diarrhea itself. People choose aisle seats, skip the commute, map restrooms before a trip and turn down a hike with friends. During a flare that can mean trip after trip all day, sometimes with blood, and a tiredness that sleep does not fix.
Pain that keeps the nights short
Cramping in the lower right belly with Crohn’s, or on the left side with colitis, and nights broken by trips to the bathroom. Pain in the belly is not always a sign of active inflammation: a protocol for a pooled review notes that about 60% of people with IBD live with chronic abdominal pain [1], and some of it persists even when the bowel looks calm on a scope. Poor sleep then feeds fatigue, low mood and worry about the next flare.
Steroids, biologics and the wait for the gastroenterologist
Standard treatment works for many people, but it asks a lot: steroid courses with weight gain and sleepless nights, infusions or injections on a fixed schedule, blood tests to watch the liver and blood counts, and weeks between appointments when a flare starts. It is in that gap, symptoms now, specialist later, that many people first ask about cannabis.
What bothers you most?
Pick one; nothing here diagnoses you.
Pain: belly pain is the most common reason people with IBD try cannabis. In surveys, many say it helps, and some say they used fewer opioids [2]. Trials that measured pain on a standard scale are still missing. See what studies tested for pain.
Urgency and diarrhea: cannabinoids slow gut movement through receptors in the gut wall, which is one reason people report fewer trips. Slower bowels do not mean less inflammation, and frequent stools with blood still need a gastroenterologist. See how the gut’s cannabinoid system works.
Sleep: in a 2026 survey of IBD outpatients, insomnia was one of the main reasons people took CBD [3]. Feeling drowsy is not the same as sleeping better, and no trial in IBD was built around sleep. See what patients report about sleep.
Appetite and weight: a study of IBD patients on medical cannabis found appetite went up, but body weight did not change [4]. See the appetite results.
Anxiety: anxiety was the most common reason for CBD use in a 2026 IBD survey [3]. THC can ease anxiety in some people and worsen it in others, and the dose matters. See what the survey found.
What is inflammatory bowel disease? Crohn’s disease and ulcerative colitis
Inflammatory bowel disease is the medical term for long-lasting inflammation of the digestive tract caused by the immune system attacking the gut. It is usually described as immune-mediated rather than a classic autoimmune disease: the immune system overreacts to gut bacteria in people with a genetic tendency, and the inflammation feeds itself. The two main types are Crohn’s disease and ulcerative colitis [5] [6]. IBD usually starts in young adults but can begin at any age, children included, and it runs in flares and quieter periods called remission.
How is IBD treated? Treatment aims to calm the inflammation and keep it calm. Doctors use aminosalicylates (5-ASA, such as mesalamine) mainly for colitis, short courses of corticosteroids for flares, immunomodulators such as azathioprine and methotrexate, and biologics: injected or infused antibodies such as infliximab, adalimumab and newer drugs that block other parts of the immune response. Surgery removes damaged bowel when medicines are not enough [5] [6]. Diet and stress do not cause IBD, though both can shape how you feel day to day.
Crohn’s disease
Where: anywhere from mouth to anus, most often the end of the small intestine (ileum) and the colon, in patches with healthy bowel between them.
How deep: through the whole thickness of the bowel wall, which is why narrowing (strictures), scarring and tunnels called fistulas can form.
Typical signs: cramping belly pain, diarrhea, weight loss, tiredness, mouth ulcers, sores or fistulas around the anus.
ICD-10 code: K50 (Crohn’s disease [regional enteritis]) [7].
Ulcerative colitis
Where: the colon and rectum only, starting at the rectum and spreading upward in one continuous stretch.
How deep: the inner lining of the colon, where it forms sores (ulcers) that bleed.
Typical signs: bloody diarrhea, mucus, urgency, a feeling of not emptying the bowel, belly cramps.
ICD-10 code: K51 (ulcerative colitis) [7].
IBD or IBS?
The names sound alike, and both can bring pain and diarrhea, but they are different conditions. Irritable bowel syndrome (IBS) is a problem of how the gut and brain communicate; IBD is visible inflammation that can damage the bowel.
| Sign | IBD (Crohn’s, colitis) | IBS |
|---|---|---|
| Inflammation on colonoscopy | Yes: ulcers, redness, swelling; confirmed by biopsy | No: the bowel looks normal |
| Blood in the stool | Common, especially in colitis | Not a feature of IBS; needs checking |
| Blood and stool markers | Often raised: CRP, ESR, fecal calprotectin; anemia | Usually normal |
| Damage to the bowel | Can cause strictures, fistulas and surgery | Does not damage the bowel |
| Treatment | Anti-inflammatory and immune medicines, sometimes surgery | Diet, stress management, symptom medicines |
Quick answers
Can IBD cause joint pain or lower back pain?
Yes. Joint pain is the most common problem outside the gut in IBD. It can affect large joints such as knees and ankles, often rising and falling with flares, or the spine and the joints at the base of the back, which cause stiffness in the lower back that is worse in the morning [5]. Tell your gastroenterologist about new joint or back pain: some IBD treatments help both, and a few can cause joint aches of their own.
Can IBD affect the mouth, skin or eyes?
It can. Mouth ulcers are common, especially in Crohn’s. Red, painful bumps on the shins, sore red eyes and, less often, liver problems can also be part of IBD [5]. A painful red eye with blurred vision needs an eye doctor the same day.
Can IBD cause constipation instead of diarrhea?
Yes. Diarrhea is typical, but constipation happens too, with colitis limited to the rectum, when a Crohn’s stricture narrows the bowel, or as a side effect of medicines. Constipation with swelling, vomiting and no gas passing at all can mean a blockage and needs urgent care.
Does IBD cause weight loss or weight gain?
Usually weight loss, from eating less during flares, poor absorption in Crohn’s and the energy inflammation burns. Weight gain also happens, often from steroid courses or from eating more in remission. Losing weight without trying is a reason to see your gastroenterologist sooner.
Does IBD show up on a blood test or colonoscopy?
Blood tests (CRP, ESR, blood count) and a stool test called fecal calprotectin can show inflammation, but they do not prove IBD on their own. The diagnosis is made with a colonoscopy and biopsies, often with imaging of the small intestine such as MRI or CT [5] [6]. Normal blood tests do not rule IBD out.
Could medical cannabis be worth discussing for your IBD?
Thirteen short questions about your diagnosis, your symptoms and the medicines you take. Your answers stay on this page and show what to bring to a physician.
13 questions · about a minute · your answers stay in this browser
Why cannabis is discussed for IBD: the gut’s own cannabinoid system
Your gut has its own cannabinoid system: the endocannabinoid system, a network of receptors and the body’s own cannabis-like molecules that helps set gut movement, pain signals and how strongly immune cells react. THC and CBD from the plant act on parts of that same network, which is why researchers have looked at them for a disease of gut inflammation [9] [10]. Gut bacteria are part of the picture too: they help process cannabinoids, and cannabinoids in turn change which bacteria thrive [11].
CB1 receptors
What it does: sits on the nerves of the gut wall and in the brain; slows gut movement and dampens pain signals.
What was seen: a plausible route for fewer cramps and fewer trips; the brain effects of THC (the high, drowsiness) also run through CB1 [9].
Where: cells, animals and the known effects of THC in people.
CB2 receptors
What it does: sits mainly on immune cells and helps tune how strongly they react.
What was seen: in some lab models switching CB2 on calmed inflammation; in a 2026 mouse study of Crohn’s-like disease it made it worse [12].
Where: cells and animals only.
Gut bacteria
What it does: the microbiome breaks down cannabinoids and can release active THC from its processed form in the gut [11].
What was seen: a review describes a 13-fold lower ratio of two common bacterial groups (Prevotella to Bacteroides) in cannabis users than in non-users [11].
Where: people (observational) and lab work; what it means for IBD is unknown.
Results in cells and animals do not transfer to people: a mouse model carries one engineered form of gut inflammation, and lab doses do not translate into a human dose.
Why one receptor can calm and worsen inflammation
CB2 is often described as “anti-inflammatory,” but the 2026 mouse study shows why that is too simple. In mice bred to develop chronic inflammation of the small intestine (ileitis) similar to Crohn’s disease, switching on CB2 helped T cells, a type of immune cell, travel to the gut and settle in its lining, and the ileitis got worse [12]. That is in animals.
In cells, the opposite direction shows up: non-psychoactive hemp extracts rich in CBD and CBG cut the activity of NF-kB, a master switch of inflammation, by 42% and 66% in a model of an inflamed gut lining [13]. That is in cells grown in a dish. Both results explain why scientists are interested; neither tells you what happens in your gut.
Can cannabis help IBD symptoms? What patients report and what trials show
Possibly, for some symptoms: pain, appetite, sleep and how unwell you feel overall. It has not been shown to heal inflammation in the gut. Most of the evidence comes from patients describing their own experience, plus a small number of randomized trials that a 2022 review pooled together [14] [15]. That is enough to make cannabis a fair question for a physician, and not enough to call it an IBD treatment.
Choose a symptom to see what was tested.
Pain
A 2025 survey of 139 people, 106 with IBD and 33 without, asked about cannabis and CBD oil. Among the IBD patients, 19.4% said they had cut back on opioid painkillers Survey [2].
Self-reported, with no standard pain scale. A pooled review of pain trials in IBD and IBS has so far been published only as a plan, without results Protocol [1].
The symptom people most often use cannabis for, and still without a measured answer.
Appetite & weight
IBD patients starting medical cannabis were followed over months, with appetite, calories and body weight recorded Cohort [4].
A single group without a placebo comparison.
Appetite went up; body weight did not change [4]. Helpful if eating feels like a chore, not a fix for weight loss from active disease.
Sleep & anxiety
A 2026 survey of 229 U.S. outpatients with IBD: 10.5% used CBD. Of them, 54.2% took it for anxiety and 41.7% each for insomnia and for pain Cross-sectional [3].
87.5% of CBD users said they felt a benefit [3] – a perception, not a measured result, with no comparison group.
Sleep and worry are where many people feel a difference; no IBD trial has tested them directly.
Disease activity
A 2022 review pooled randomized, placebo-controlled trials of cannabinoids added to usual IBD treatment Pooled trials [14]. In the 2025 survey, 14.5% of IBD patients said cannabis had put their disease into remission, their own words, not a scope result Survey [2].
Symptom scores improved in the pooled trials; for “therapeutic success” the trials showed no clear difference from placebo [14].
Feeling better was measured. Less inflammation on a scope was not.
How big is the effect?
A chart of effect sizes needs several studies that measure the same outcome the same way, each with a margin of error. For cannabis in IBD, only the pooled trial review gives such numbers, and its two results sit on different scales, so a chart would mislead. The clearest single number is this one.
What this means in practice: if pain, poor appetite or sleepless nights are wearing you down despite treatment, a physician may consider cannabis alongside, never instead of, the medicines that control the inflammation.
How a medical cannabis evaluation with a licensed physician works
What the research shows, from strongest to weakest
Not every study counts the same. A randomized trial in people answers “does it help?” far better than a mouse experiment or a survey. Here is what exists for cannabis and IBD at each level, with the background studies clearly marked.
| Level | What exists for IBD | What it can and cannot tell you |
|---|---|---|
| Pooled trials and reviews | A 2022 review pooling randomized trials found better symptom scores, with no clear difference in “therapeutic success” [14]; a 2021 scoping review called the effect on the disease itself inconclusive [15]. | The best summary available; only as strong as the few small trials inside it. |
| Randomized trials | A handful of small placebo-controlled trials of cannabinoids added to usual care, known mainly through that pooled review [14]. | Can show a symptom effect and side effects; too small and short to show healing or long-term safety. |
| Cohorts and case-control studies | Appetite rose without weight gain in patients on medical cannabis [4]; cannabis users had more inflammation on endoscopy and needed more sedation [16]. | Shows links in real patients, not cause; users may differ from non-users in many ways. |
| Surveys and cross-sectional studies | Many surveys of why and how people with IBD use cannabis and CBD, and what they feel it does [3] [2] [17]. | Tells you what patients experience and believe; cannot separate the effect of cannabis from hope or a good week. |
| Animal and cell studies | CB2 worsened Crohn’s-like ileitis in mice [12]; hemp extracts calmed inflammation signals in cells [13]. | Explains why scientists are interested; says nothing yet about patients. |
Browse the studies yourself
Every study cited on this page, in plain words. Neutral and negative results are included.
Cannabinoids added to IBD treatment, trial by trial
Symptom scores dropped more than with placebo: the CDAI by 36.6 points (95% CI 12.3-61.2), while “therapeutic success” showed no clear difference [14].
Can cannabis protect against IBD?
Across the trials and observational studies it gathered, symptom relief appeared, but whether cannabis changes the disease itself was inconclusive [15].
Cannabis in Crohn’s and colitis beyond misuse
Summarized the case for and against cannabinoids in both diseases: symptom and quality-of-life benefits are reported, while an effect on inflammation remains unproven [10].
Medical cannabis and gut bacteria
Gut microbes help process cannabinoids and shift with cannabis use; the review also notes that CBD oil studied at 50-600 mg a day in clinical studies showed no effects, and that about 9% of long-term users show signs of dependence [11].
The endocannabinoid system in human disease
Explains how the body’s cannabinoid receptors link gut, immune system and brain, and which drug targets are being explored [9].
Cannabinoids and scarring of the bowel
Scarring (fibrosis) affects about 30% of people with Crohn’s; the review gathers mostly lab and animal evidence that the cannabinoid system could be a target [8].
A planned review of pain treatments in IBD and IBS
Sets out how cannabis-based medicines for gut pain will be judged; it has no results yet [1].
Cannabis, opioids and gut bacteria
Reviews how psychoactive plant substances affect E. coli in the gut; in lab work, CBD made bacteria more sensitive to some antibiotics [18].
Cannabis use and what the endoscopy showed
Users had inflammation on endoscopy more often (69.4% vs 50%), longer procedures and more sedation than matched non-users [16].
Appetite up, weight unchanged
In IBD patients treated with medical cannabis, appetite increased but body weight did not change [4].
IBD medicines and heart risk in older adults
In Medicare patients, immunomodulators (hazard ratio 0.84, 95% CI 0.61-1.17) and biologics (0.86, 0.59-1.24) were not linked to more heart attacks or strokes than 5-ASA [19].
Who uses CBD at an IBD clinic, and why
10.5% used CBD, mostly for anxiety (54.2%), insomnia and pain (41.7% each); 87.5% of users felt it helped [3].
Patients believe cannabis and CBD oil relieve symptoms
53.8% of IBD patients and 45.5% of controls used cannabis; 19.4% of patients cut opioid use and 14.5% described remission in their own words [2].
Patients’ view of marijuana for IBD
Most participants believed marijuana eased their symptoms and saw it as fairly safe; effects were self-reported [20].
How medical cannabis is used in IBD
Most users chose high-THC products and inhaled them; many reported symptom relief, alongside side effects [17].
Cannabis use among IBD patients in Puerto Rico
Asked about use and attitudes; the authors describe how cannabinoids may slow the processing of azathioprine and methotrexate and speed up that of infliximab and adalimumab, a mechanism, not measured [21].
Women with IBD of childbearing age
Looked at how common cannabis use is in this group and how safe women believe it to be, including around pregnancy [22].
Pandemic habits and mental health in IBD
People who drank, smoked or used cannabis more during COVID-19 were more likely to report elevated mental health symptoms (odds ratio 1.93, 95% CI 1.44-2.60) [23].
Substance use and school in teens with chronic illness
Teens who used cannabis were more likely to report lower grades (risk ratio 1.54, 95% CI 1.13-2.11) and skipped school [24].
War and barriers to IBD care
Wartime stress and disruption made it harder for patients in Israel to get care and stay on their medicines [25].
CB2 and Crohn’s-like ileitis in mice
Switching on CB2 sent more T cells to the gut and made chronic ileitis worse in mice [12].
Non-psychoactive hemp extracts in an inflamed gut model
Extracts standardized in CBD and CBG cut NF-kB inflammation signaling by 42% and 66% in cells [13].
No studies of this type are cited on this page.
What kinds of studies is this evidence built on?
How to read it: each row is one group of studies, and the bar shows how many published studies on cannabinoids and IBD fall into it. The number at the end of the row is the count. Stronger designs are at the top. Gray bars are commentary, animal and lab work, which cannot answer whether something helps patients.
Show as a table
| Design | Studies |
|---|---|
| Clinical guidelines | 1 |
| Meta-analyses | 6 |
| Systematic reviews | 10 |
| Randomized trials | 8 |
| Other clinical trials | 3 |
| Cohort studies | 37 |
| Case-control studies | 2 |
| Cross-sectional studies | 14 |
| Surveys | 18 |
| Case reports | 1 |
| Narrative reviews | 79 |
| Animal studies | 12 |
| Cell and lab studies | 7 |
| Studied | Studies |
|---|---|
| People in clinical trials | 31 |
| People observed, not treated | 104 |
| Whole populations | 32 |
| Animals | 6 |
| Cells and molecules | 10 |
| Research methods | 2 |
| Not classified | 53 |
| Year | Studies |
|---|---|
| 2026 | 4 |
| 2025 | 7 |
| 2024 | 3 |
| 2023 | 5 |
| 2022 | 1 |
| 2021 | 1 |
| 2020 | 1 |
Which cannabinoids have been studied for IBD?
“Cannabis” in these studies means very different things: THC, the compound that causes a high; CBD, which does not; products that mix the two; minor cannabinoids such as CBG; and prescription medicines made from or modeled on them. A result for one does not carry over to another: the drowsiness of THC says nothing about a CBD-only oil, and a CBD study says nothing about THC.
| Substance | What was studied | Design | What came out |
|---|---|---|---|
| Dispensary products (available with a medical card where your state allows) | |||
| THC | Symptoms and quality of life in people using medical cannabis; most chose high-THC products and inhaled them [17]. | Surveys; cohorts | Symptom relief reported, alongside side effects; appetite up without weight gain [4]. |
| CBD | CBD oil at 50-600 mg a day in clinical studies; reasons for use in IBD outpatients [11] [3]. | Clinical studies; surveys | The clinical studies at those doses showed no effects [11]; users report less anxiety, better sleep and less pain [3]. Doses here are the ones used in studies, not advice. |
| THC + CBD products | Cannabinoids added to usual IBD treatment in randomized trials; cannabis and CBD oil use reported by patients [14] [2]. | Pooled trials; surveys | Better symptom scores than placebo; no clear difference in “therapeutic success” [14]. |
| CBG | Hemp extracts standardized in CBD and CBG, with almost no THC, in a cell model of an inflamed gut lining [13]. | Cell study | Inflammation signaling fell in cells; no data in people [13]. |
| Prescription medicines (FDA-approved, by prescription, not through a card) | |||
| Dronabinol (Marinol, Syndros) | A synthetic form of THC, approved for chemotherapy nausea and AIDS-related weight loss [26]. | Approved medicine | Not approved for IBD. |
| Nabilone (Cesamet) | A synthetic cannabinoid approved for chemotherapy nausea [26]. | Approved medicine | Not approved for IBD. |
| Cannabidiol (Epidiolex) | A purified CBD medicine approved for certain rare seizure disorders [26]. | Approved medicine | Not approved for IBD. |
Ways to use cannabis with IBD: what each form avoids
Cannabis is not only smoked. People with IBD also vape it, swallow it as gummies, capsules or oils, hold drops under the tongue, rub it on the skin and, rarely, use suppositories. In one IBD survey most medical users inhaled high-THC products [17], while in another, CBD oil was common [2]. Each form avoids some risks and keeps others. This section explains the differences; it does not recommend a form.
How is it used, or how would it be?
Choose the closest; many people combine more than one.
Specific to smoking
Joints, blunts, pipes and bongs burn plant material, and the smoke irritates the throat and lungs. Blunts and spliffs add tobacco, and tobacco smoking is known to make Crohn’s disease worse [5]. The effect starts within minutes and the dose is hard to measure. Some people notice looser stools after smoking; see whether smoking cannabis can cause diarrhea.
Specific to vaping and dabbing
Dry-herb vaporizers, oil pens and cartridges avoid burning, but hot vapor still travels the same airways. Concentrates used for dabbing (wax, shatter, rosin) are very strong, which makes the dose even harder to control.
Shared devices
A pipe, vape or joint passed between people also passes on colds and other infections, worth thinking about if you take an immunosuppressant or a biologic, which lower your defenses.
Specific to edibles and capsules
Gummies, chocolates, drinks, capsules and swallowed oils avoid smoke entirely. They act slowly, often an hour or more, last for hours, and pass through the liver before reaching the blood. With an inflamed bowel, fast transit or part of the intestine removed, absorption may be less predictable. The classic mistake is a second piece “because the first did nothing.”
Specific to tinctures and sprays
Drops held under the tongue and mouth sprays avoid the lungs and are measured by the drop or spray. Part of each dose is still swallowed and goes through the gut and liver like an edible.
Specific to topicals and patches
Creams and balms act mainly where they are applied and are not a way to reach gut inflammation. Transdermal patches are different: they deliver cannabinoids into the bloodstream, so their effects on the brain and on other medicines count the same as any other form.
Specific to suppositories
Rectal products are rare. Researchers are interested in them because they place the substance where colitis sits, but data in people are scarce, and an inflamed rectum may react to the product itself. They avoid smoke and the first pass through the liver; what reaches the blood still counts.
Specific to prescription cannabinoids
Dronabinol, nabilone and Epidiolex have an exact dose, are prescribed by a doctor and filled at a pharmacy, not bought with a medical card. None is approved for IBD [26], and dronabinol and nabilone carry the same drowsiness and dizziness as THC.
True of every form
- THC can cause drowsiness, dizziness and anxiety, whatever way it enters the body.
- Whatever reaches the blood is processed by the liver and can change how IBD medicines are handled [21].
- Gut bacteria can turn processed THC back into its active form, so effects can linger [11].
- It adds to the effect of other sedating medicines, including opioid painkillers and sleep aids.
- No driving after use.
Choosing a form is a conversation for the appointment.
All forms as a table
| Form | What it avoids | What remains |
|---|---|---|
| Smoking | Delay in onset | Smoke in the airways, tobacco in blunts, shared devices, hard-to-measure dose, all effects of THC |
| Vaping & dabbing | Burning plant material | Hot vapor in the airways, very strong concentrates, shared devices, all effects of THC |
| Edibles & capsules | Smoke and vapor, shared devices | Slow, long effect, risk of a repeat dose, uneven absorption, liver processing, interactions |
| Tinctures & sprays | Smoke and vapor, shared devices | Partly swallowed dose, effects on the brain, interactions |
| Topicals | Most effects on the brain | Skin reactions; no effect on gut inflammation |
| Transdermal patches | Smoke, vapor and swallowing | Effects on the brain, interactions |
| Suppositories | Smoke, vapor and the first pass through the liver | Irritation of an inflamed rectum, little data, effects of what reaches the blood |
| Prescription cannabinoids | Unknown product content | Drowsiness, dizziness, interactions; not approved for IBD |
What science doesn’t know yet, and where the data disagree
The gaps are not a footnote here; they are a large part of the story. Many studies of cannabis and IBD end without a clear conclusion, and some point in opposite directions. Researchers who wrote about them list the same problems again and again.
- Mostly observation, few trials. Evidence in people comes largely from surveys, records and small trials; studies of oral CBD used high doses or gave mixed results [11].
- No standard dose or product. Studies use different strains, ratios, forms and doses, and many rely on what patients remember rather than on validated questionnaires [2].
- One mouse model. The 2026 CB2 finding comes from a single engineered mouse model of ileitis plus cell lines [12]; cell studies used cancer-derived cells in a dish [13].
- Scarring has no human trials. The idea that cannabinoids could ease bowel scarring rests on lab and animal work only [8].
- Not in the guidelines. CBD is not part of U.S. IBD treatment guidelines, and commercial products vary in content and quality.
- Feeling better is measured; healing is not. Trials scored symptoms, but none in this set showed less inflammation on a scope [14].
Reasons for interest
Reasons for caution
Side effects and safety with IBD
Is cannabis bad for IBD? For most adults the common side effects are mild and pass, but some matter more when you live with a chronic gut disease: a drug that masks pain can hide a flare, and a body that is already tired has less room for drowsiness. People with IBD who use medical cannabis report symptom relief and side effects side by side [17].
Drowsiness and fatigue
Among the side effects most often reported by IBD patients using cannabis [17]. IBD fatigue is already common, and the two can add up.
Dizziness
Light-headedness and spinning are reported, especially after a larger dose or when standing up fast, and more so if you are dehydrated after diarrhea.
Dry mouth
Common and harmless on its own, but it adds to the dryness some people already have with mouth ulcers or dehydration.
Appetite changes
Appetite can go up or, less often, down. In IBD patients it rose without changing body weight [4].
Dependence
About 9% of long-term users show signs of dependence, and 42% of current users met criteria for it in the data a 2024 review cites [11]. Daily use for a lifelong disease makes this a real question.
Sedation for endoscopy
Cannabis users with IBD needed more sedative during endoscopy, and their procedures took longer [16]. Your endoscopy team needs to know.
Interactions with IBD medicines are a separate question, covered next.
IBD medicines and cannabis: interactions to discuss with a doctor
The most common worry is “I’m on a biologic, can I use cannabis at all?” The honest answer: the studies here describe possible interactions based on how the drugs are processed, not measured problems in patients. That is a reason to plan with a physician, not a reason for panic.
Open each one. This is what studies recorded, not a complete list.
Azathioprine mechanism only
Cannabinoids may slow the breakdown of azathioprine, so more of it could stay in the body longer [21]. Azathioprine already needs blood tests for the liver and blood counts; your physician may want them checked more closely. This is based on how the drugs are processed, not on patient data.
Methotrexate mechanism only
The same direction: slower breakdown, so levels could rise [21]. Methotrexate also affects the liver, which processes cannabinoids too. Do not change your methotrexate schedule to make room for cannabis.
Infliximab mechanism only
The opposite direction: cannabinoids may speed up how infliximab is cleared [21]. If that happens, the drug level between infusions could drop. Your gastroenterologist can measure drug levels if a flare comes back.
Adalimumab mechanism only
Also listed as possibly cleared faster [21]. The same advice applies: no change to the injection schedule, and tell the doctor who prescribes it. Newer biologics and small-molecule drugs were not covered in these studies.
Antibiotics: erythromycin, rifampicin, vancomycin lab finding
In lab work, CBD made bacteria more sensitive to these antibiotics [18]. That is a laboratory effect, not a measured change in patients. Antibiotics are used in IBD for abscesses, fistulas and pouchitis; mention cannabis whenever one is prescribed.
Steroids and 5-ASA (mesalamine) no data
The studies on this page do not report interactions between cannabis and corticosteroids such as prednisone or budesonide, or 5-ASA drugs such as mesalamine. No data is not the same as no interaction; your physician checks these one by one.
Pain relievers and sedating medicines general caution
Opioid painkillers and sleep aids add their drowsiness to THC. NSAID pain relievers such as ibuprofen can trigger IBD flares on their own [5], whatever you combine them with. More on mixing cannabis and ibuprofen.
Bring the complete list, prescriptions with doses and your infusion or injection schedule, over-the-counter pain relievers, supplements and anything taken “only sometimes”, to the appointment. That list, more than the diagnosis, decides whether cannabis is reasonable to try.
Who should not use cannabis for IBD, and when to see a doctor first
For some people the answer is “not now” or “not at all,” whatever the symptom. Reviewers advise against THC-containing products for these groups, and trials routinely leave them out, so there is no evidence of safety for them.
- Pregnancy, plans for pregnancy or breastfeeding – THC passes to the baby. Women with IBD of childbearing age are a group in which cannabis use has been specifically studied [22]; raise it with your gastroenterologist and obstetrician.
- A personal or family history of psychosis or bipolar disorder – THC can trigger or worsen symptoms. See cannabis and psychosis.
- Heart disease – a history of angina or heart attack is a reason reviewers give to avoid THC.
- Teenagers and young adults – starting before age 17 is linked to an 18 times higher chance of dependence by age 30 [11], and teens who used cannabis reported lower grades more often [24]. IBD often starts at exactly this age.
- Several sedating medicines already – opioid painkillers, benzodiazepines, sleeping pills.
- Anyone who drives or operates machinery after use, in any form.
- A severe flare, heavy bleeding or a fever – these need urgent medical care first, not cannabis.
Talk to a licensed physician about whether any of these apply
Is IBD a qualifying condition for a medical card?
It depends on your state. Every medical cannabis program keeps its own list of qualifying conditions, and a physician has to match your diagnosis to that list, not to a symptom. Many programs name Crohn’s disease outright, some name inflammatory bowel disease or ulcerative colitis, and others do not mention IBD but cover conditions that often come with it, such as chronic pain, severe nausea or wasting. A few let a physician certify any condition they judge debilitating.
The lists change as legislatures and health departments update them, so the current wording for your state is the one that counts. The physician confirms it at the evaluation, using your records: a colonoscopy report, a biopsy result or a gastroenterologist’s note.
Crohn’s or IBD is named in your state
The simplest case. Bring a record of the diagnosis and the physician evaluates you against that listed condition. Ulcerative colitis is sometimes listed separately or covered by broader wording.
A condition you also have is listed
Chronic pain, nausea, cachexia (severe weight and muscle loss) or anxiety may be on the list even where IBD is not. What counts is a diagnosis in your records, not a symptom alone.
Neither is on the list
A card may not be available yet where you live. Some states let physicians certify other debilitating conditions or accept petitions to add new ones.
What else has a doctor diagnosed?
State lists name diagnoses, not symptoms: pick what is in your records.
Chronic pain: the most widely listed condition across state programs, and belly pain that outlasts the inflammation is common in IBD. Read chronic pain and medical cannabis.
Nausea: severe or persistent nausea is listed in many programs. Read nausea and medical cannabis.
Anxiety: several states list anxiety disorders or accept them under broader wording, and anxiety was the top reason for CBD use in an IBD survey [3]. Read anxiety and medical cannabis.
Insomnia: a diagnosed sleep disorder is listed in some programs. Read insomnia and medical cannabis.
Arthritis: IBD-related joint inflammation may be recorded as arthritis, which some programs list. Read arthritis and medical cannabis.
Depression: fewer states list it, and THC can affect mood in both directions. Read depression and medical cannabis.
None of these: then the decision rests on your state’s wording for IBD and the physician’s judgment. Start with your state’s medical marijuana laws.
Medical card or recreational purchase
In states with adult-use sales, adults can buy without a card, and in those states a card is optional. It still changes several things, though the details are set state by state.
| Aspect | With a medical card | Recreational |
|---|---|---|
| Taxes | Often lower; some states waive part of the cannabis tax for patients | Full state and local cannabis taxes |
| Purchase and possession limits | Often higher; depends on your state | Set for adult-use buyers |
| Products | Medical dispensaries and, in some states, medical-only products | Adult-use product range |
| Age | Patient age rules set by each program | Adult-use age limit set by the state |
| Physician involvement | A licensed physician reviews your diagnosis and IBD medicines | None |
| Document | State card or recommendation, recorded in a confidential registry | Government ID only |
Will a card save you money?
It can, but only where your state taxes patients less than recreational buyers, and the amount depends on your state’s rates and how much you buy. For someone using cannabis daily for a lifelong condition, the difference adds up over a year; weigh it against the evaluation fee and any state registration fee. The breakdown is in medical vs. recreational cannabis taxes.
What the program in your state involves
Qualifying is the first of two steps. In most states a physician’s recommendation is followed by registration with the state health department, which issues the card and enters you in a confidential patient registry; in a few, the recommendation itself is what a dispensary asks for. Purchases happen at licensed dispensaries, some of which deliver, and products there are lab-tested and labeled with their THC and CBD content, useful when you need to know exactly what you are taking alongside IBD medicines.
Each state also sets its own possession limits, taxes and home-growing rules, and many state laws let a patient name a registered caregiver who may buy and handle products on their behalf. Cards from one state are not automatically valid in another; see which states accept out-of-state cards if you move or travel. Limits, cultivation and taxes are listed state by state on the laws and regulations pages.
What this means if you are considering it
A good evaluation is a conversation about one or two specific symptoms, the IBD medicines you take and what would count as “better.” It goes faster and safer when the facts are on the table, and it starts from your situation, not from a product.
What to bring to the appointment
Tap each item as you get it ready.
Questions worth asking
- Could cannabis change how my azathioprine, methotrexate or biologic works, and what would we check?
- THC, CBD or both, and why that choice for my symptom?
- How will we tell symptom relief apart from the disease actually calming down?
- Should my gastroenterologist and endoscopy team know, and what do I tell them?
- What should make me stop right away?
An evaluation makes sense if
- A specific symptom, pain, appetite, sleep, anxiety, has not settled despite treatment.
- Your IBD is under a gastroenterologist’s care and you plan to stay on it.
- Your full medicine list can be reviewed.
- Your state’s program covers IBD or a related diagnosis.
It is not the right step if
- The hope is to replace IBD medicines or heal the bowel.
- You are in a severe flare that has not been seen by a doctor.
- You are pregnant or breastfeeding.
- There is a history of psychosis.
This page summarizes published research for education. It does not replace a physician’s advice. Cannabis has not been shown to heal inflammation or keep IBD in remission, and it can affect how some IBD medicines are processed.
How to get a medical card for IBD online
Everything happens online, so there is nowhere to travel, useful when a long drive is the last thing your gut needs. Four steps take you from the first form to a card in your hand.
Fill in the intake form
Your state, your diagnoses and your current medicines. Have the record of your Crohn’s or colitis diagnosis ready to upload.
See a physician licensed in your state
A one-on-one appointment online. You agree on the time with the physician; keep an hour free rather than a minute.
Receive your signed recommendation
If the physician approves, the signed recommendation arrives in your account after the appointment.
Register with your state
Where required, you submit the recommendation to the state program, which reviews it and issues the card.
What you end up with
Across 250 reviews from patients in the states where we are licensed. We do not sort them by score and do not hide the low ones.
- 150,000+patients evaluated – everyone who has been through an appointment with us, in every state where we are licensed
- Since 2017doing only this: online evaluations for medical cannabis programs, and nothing else on the side
A recommendation from a physician licensed where you live, and, once your state registers it, a card that lets you buy at licensed dispensaries. Your documents stay in your account, and how the medical card works explains the evaluation in detail. The physicians who see patients and review this page are listed on our physicians page.
Programs for veterans and for people with low income are available in some states.
Questions people ask about IBD and cannabis
Is cannabis bad for IBD?
Not for everyone, but it is not harmless either. Smoke and vapor irritate the airways; every form can cause drowsiness and dizziness and may change how azathioprine, methotrexate or biologics are processed [21]. In one study, cannabis users with IBD had inflammation on endoscopy more often than non-users (69.4% vs 50%) [16] – a link, not proof of harm. The biggest risk is feeling better while inflammation continues, so keep your gastroenterologist in the loop.
Can IBD be cured, or does it go away?
Medicine cannot cure Crohn’s disease; it can put it into long remission. In ulcerative colitis, removing the colon and rectum ends the disease in the bowel, though it is a major operation with its own trade-offs. IBD does not simply go away on its own, but many people spend long stretches with few or no symptoms on treatment [5] [6]. Cannabis has not been shown to change the course.
How long does an IBD flare last?
Anywhere from days to months, depending on how severe it is and how quickly treatment is adjusted. A flare that lasts more than a few days, or comes with blood, fever or weight loss, is a reason to call your gastroenterologist rather than wait it out.
Is IBD an autoimmune disease?
It is an immune-mediated disease: the immune system attacks the gut, triggered by gut bacteria in people with a genetic tendency. Many people call it autoimmune, and it shares features with autoimmune diseases, which is why the medicines that treat it calm the immune system [5].
Is IBD caused by stress?
Does IBD increase the risk of colon cancer?
Yes, when the colon has been inflamed for many years, especially in extensive colitis or Crohn’s of the colon. That is why gastroenterologists recommend regular surveillance colonoscopies [5]. Cannabis does not replace them, keep every scheduled scope.
Which foods should I avoid with IBD?
There is no single IBD diet. Many people feel worse with high-fat, spicy or very fibrous foods, dairy or alcohol during a flare, and a low-residue diet may be advised if you have a stricture [5]. A food diary helps you find your own triggers; a gastroenterologist or dietitian can build a meal plan that keeps your nutrition up.
Can I use cannabis with biologics or GLP-1 medicines?
For infliximab and adalimumab, cannabinoids may speed up how the drug is cleared, a mechanism, not measured in patients [21]. Newer biologics and GLP-1 medicines such as semaglutide were not studied with cannabis in the research on this page, so there is no data either way. Your physician reviews them one by one.
What about delta-8 THC or CBD products sold without a card?
Hemp-derived products sold in shops and online are often less tightly regulated than dispensary products, and labels may not match what is inside. Delta-8 THC acts much like regular THC, with the same drowsiness and interaction questions. A dispensary product is lab-tested and labeled, which matters when you take IBD medicines.
Can I use my card in another state?
Sometimes. Reciprocity (one state honoring another state’s card) exists in some states and not others, and rules for visitors vary. Check which states accept out-of-state cards and traveling with cannabis before a trip.
What if my card is lost?
Most states let you request a replacement from the program that issued it, and your recommendation stays in your account. The steps are in what to do if your card is lost and the medical card FAQ.
How do I renew my medical card?
Cards expire on a schedule your state sets, and renewal means a repeat evaluation with your updated medicines and a new recommendation. Bring any changes since last time: a new biologic, surgery, a change in diagnosis. Renewal starts from your account; see how the medical card works, or choose your state from the list at the top of this page.
How much does it cost, and what if I’m not approved?
The evaluation fee for your state is shown before you pay; a state registration fee, where one exists, is paid to the state separately. Whether a recommendation is issued is the physician’s medical decision. Details for both are on how the medical card works.
Is an online evaluation legitimate?
Yes, where state law allows telemedicine for medical cannabis evaluations. Telemedicine simply means the appointment happens online: it is one-on-one with a physician licensed in your state, and the recommendation is the same document an in-person visit would produce.
Who finds out? Privacy, firearms and work
Privacy: your medical records are protected under the HIPAA Privacy Rule [27], and state patient registries are confidential; dispensaries and law enforcement can usually check only whether a card is valid.
Firearms: federal law bars anyone who is an “unlawful user” of a controlled substance from having a firearm [28], and cannabis remains federally controlled, so a state card does not change the federal rule.
Work: employment protections for card holders differ by state, and many employers can still enforce drug-free policies. Read your state’s rules on the laws and regulations pages.
More research on cannabis and inflammatory bowel disease
This page cites a selection of studies. Our research library holds every study we track on cannabis and inflammatory bowel disease, from laboratory work to clinical trials, and lets you filter them by cannabinoid, study type and year.
- studies
- 630+
- in people
- 230+
- clinical trials
- 13
Related digestive and chronic conditions
IBD often travels with other diagnoses, and some of them appear on more state lists. Each page below covers its own research and qualifying rules.
IBD resources and latest research
For background on how cannabis works in the body and the gut, and for new articles as research comes out:
References
28 sources
- 1. Endocannabinoid system modulation for visceral abdominal pain in inflammatory bowel disease and irritable bowel syndrome: A protocol for systematic review and meta-analysis. DOI: 10.12688/hrbopenres.14082.2 PMID: 40860020
- 2. Inflammatory bowel disease patients believe cannabis and cannabidiol oil relieve symptoms. DOI: 10.20935/acadmed7773 PMID: 40687272
- 3. Cannabidiol Use in Inflammatory Bowel Disease: Insights From a Gastroenterology Outpatient Population. DOI: 10.1002/jgh3.70402 PMID: 41958467
- 4. Medical Cannabis Increases Appetite but Not Body Weight in Patients with Inflammatory Bowel Diseases. DOI: 10.3390/nu16010078 PMID: 38201908
- 5. National Institute of Diabetes and Digestive and Kidney Diseases. Crohn’s Disease. 2024.
- 6. National Institute of Diabetes and Digestive and Kidney Diseases. Ulcerative Colitis. 2024.
- 7. Centers for Disease Control and Prevention, National Center for Health Statistics. ICD-10-CM: International Classification of Diseases, Tenth Revision, Clinical Modification. 2026.
- 8. The endocannabinoid system as a therapeutic target in intestinal fibrosis. DOI: 10.3389/fphar.2025.1669951 PMID: 41111512
- 9. The Endocannabinoid System in Human Disease: Molecular Signaling, Receptor Pharmacology, and Therapeutic Innovation. DOI: 10.3390/ijms262211132 PMID: 41303613
- 10. Cannabis and Canabidinoids on the Inflammatory Bowel Diseases: Going Beyond Misuse. DOI: 10.3390/ijms21082940 PMID: 32331305
- 11. Medicinal Cannabis and the Intestinal Microbiome. DOI: 10.3390/ph17121702 PMID: 39770543
- 12. CB2R promotes T cell gut homing and exacerbates ileitis in a murine Crohn’s model. DOI: 10.1093/ibd/izag066 PMID: 42133571
- 13. Efficacy of non-psychotropic Cannabis sativa L. standardized extracts in a model of intestinal inflammation. DOI: 10.1186/s42238-025-00335-2 PMID: 41053843
- 14. Cannabinoid Therapeutic Effects in Inflammatory Bowel Diseases: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. DOI: 10.3390/biomedicines10102439 PMID: 36289701
- 15. Cannabis and Its Potential Protective Role Against Inflammatory Bowel Disease: A Scoping Review. DOI: 10.7759/cureus.18841 PMID: 34804696
- 16. Cannabis use in Patients With Inflammatory Bowel Disease is Associated With Longer Endoscopic Duration and Endoscopic Inflammation. DOI: 10.1093/crocol/otaf034 PMID: 40667460
- 17. Medical Cannabis Use Patterns and Adverse Effects in Inflammatory Bowel Disease. DOI: 10.1097/MCG.0000000000001782 PMID: 36227025
- 18. Interactions Between Plant-Derived Psychoactive Substances and Escherichia coli. DOI: 10.3390/molecules31050893 PMID: 41828880
- 19. Immunomodulators, Biologics, and 5-ASA for Inflammatory Bowel Disease and Major Adverse Cardiovascular Events in Older Adults. DOI: 10.1001/jamanetworkopen.2026.9091 PMID: 42054028
- 20. Patients’ perspectives on marijuana use for inflammatory bowel disease: a multicenter survey. DOI: 10.20524/aog.2023.0829 PMID: 38023973
- 21. A Survey of Cannabis Use among Patients with Inflammatory Bowel Disease (IBD). DOI: 10.3390/ijerph20065129 PMID: 36982049
- 22. Perceptions and Prevalence of Cannabis Use in Women With Inflammatory Bowel Disease of Reproductive Age: A Cross-Sectional Study. DOI: 10.1093/jcag/gwad049 PMID: 38596807
- 23. The Association Between Increased Maladaptive Health Behaviors and Elevated Mental Health Symptoms Among Persons with IBD During the COVID-19 Pandemic. DOI: 10.1093/jcag/gwad030 PMID: 37811529
- 24. Substance Use and Educational Impacts in Youth With and Without Chronic Illness. DOI: 10.1016/j.amepre.2023.09.029 PMID: 37802307
- 25. The War in Gaza and Barriers to Inflammatory Bowel Disease Care. DOI: 10.1002/jgh3.70184 PMID: 40371236
- 26. U.S. Food and Drug Administration. FDA Regulation of Cannabis and Cannabis-Derived Products, Including Cannabidiol (CBD). 2024.
- 27. U.S. Department of Health and Human Services. The HIPAA Privacy Rule. 2024.
- 28. Legal Information Institute, Cornell Law School. 18 U.S. Code § 922: Unlawful acts. 2026.