Medical Cannabis and Cannabinoids in Cancer Treatment
Medical cannabis does not treat cancer itself. In clinical studies it helped some people with chemotherapy nausea, and it is being studied for cancer pain, appetite loss, sleep and worry. It works alongside your cancer treatment, never instead of it, and the decision to try it belongs in a conversation with your oncologist.
Medical cannabis and cancer at a glance
Here is the short version of what the research says for people living with cancer. Each point is explained further down the page, with its sources.
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Chemo nausea
The clearest signal. In randomized trials, a THC:CBD extract added to standard anti-nausea medicines lowered nausea for some patients compared with placebo [1][2].
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Cancer pain
Some reviews see a modest benefit, but the certainty of that evidence is very low and results against placebo are mixed [3].
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Appetite and weight
THC-based prescription medicines exist for appetite problems in some conditions; for cancer weight loss the human data is still thin [4].
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Sleep, anxiety and mood
In a state-program cohort, anxiety and depression scores improved more in people taking cannabis by mouth [5].
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The tumor itself
Effects on cancer cells come from lab and animal studies only. They have not been shown to shrink tumors in people [6].
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Safety and your medicines
Cannabis can change how the liver handles opioids, antidepressants, blood thinners and some chemotherapy drugs, so your care team needs to know [7].
Start where you are
- I’m in chemo or radiation now What may ease nausea, pain and appetite loss, and which interactions to check first.
- Does cancer qualify in my state? How state programs list cancer and what to bring to your evaluation.
- I already have a card Renewing while treatment continues, and what to tell the doctor when your medicines change.
- What does the science really say? Which claims were tested in people, which only in the lab, and how strong each one is.
Living with cancer symptoms: pain, nausea and appetite loss
Cancer and its treatment often bring symptoms that wear you down long before the scans change: pain that comes in waves, nausea on infusion days, meals that stop tasting like anything, nights without real sleep. These symptoms are common, they are real medical problems, and they deserve treatment of their own.
Does cancer cause pain?
Often, yes. The National Cancer Institute calls pain one of the most common symptoms in people with cancer. It can come from the tumor pressing on bones, nerves or organs, from treatment itself (surgery, nerve damage from chemotherapy, mouth sores, skin irritation from radiation), and even from tests and procedures. Pain can also continue after treatment ends [8].
Doctors record this kind of pain with its own diagnosis code in the U.S. ICD-10-CM system, the classification used on medical records and insurance claims: neoplasm-related pain, code G89.3 [9]. Having it written down matters, because it makes the pain part of your official care plan.
Why do people with cancer lose weight and appetite?
Some weight loss comes from eating less: nausea, mouth sores and taste changes all get in the way. But cancer can also cause cachexia, a wasting syndrome in which the body loses fat and muscle and grows weak even when a person is eating [10]. That is why “just eat more” rarely solves it, and why appetite is treated as a medical problem, not a matter of willpower.
When standard medicines aren’t enough
Anti-nausea medicines and pain relievers work well for many people, yet not for everyone. Some patients still feel sick on chemotherapy days despite their prescriptions. Opioids can relieve pain but bring constipation, drowsiness and worries about dependence. Sleep aids can leave a heavy, foggy morning.
This gap is where cannabinoids, the active compounds in cannabis, have been studied: not as a cancer treatment, but as supportive care added to standard medicines. The next sections show where that research is solid, where it is thin, and what it means for you.
Cancer basics: symptoms, staging and common myths
Cancer is a disease in which some of the body’s cells grow uncontrollably and can spread to other parts of the body [11]. Below are plain answers to the questions people search most often after a diagnosis, before we turn to cannabis.
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Common cancer symptoms
Symptoms depend on where the cancer is and how it is treated. Many of them can also have everyday causes, so a symptom on this list is a reason to ask a doctor, not a diagnosis.
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How cancer forms and spreads
Cancer starts with genetic changes in cells that control how they grow and divide. These changes can come from errors as cells divide, from damage such as tobacco smoke or UV radiation, or can be inherited. When cancer spreads to distant parts of the body it is called metastasis, and it keeps the name of the original cancer [11].
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How cancer is staged
Most cancers are staged with the TNM system: the size of the main tumor (T), whether nearby lymph nodes are involved (N), and whether it has spread (M). Stages run from 0 to IV; stage IV means the cancer has reached distant parts of the body. A cancer keeps the stage given at diagnosis, even if it changes later [13].
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Cancer-free vs. remission
Remission means signs and symptoms of cancer have decreased (partial) or disappeared (complete). Doctors are careful with “cancer-free” or “cured,” because some cancers can return years later. That is why follow-up scans continue after treatment ends, and why fear of recurrence is so common.
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Is cancer terminal or chronic?
It depends on the type and stage. Many cancers found early are treated with the aim of cure. Others are managed for years like a chronic illness, with treatment that keeps them under control. “Terminal” is used only when a cancer can no longer be controlled, and your oncologist is the right person to explain where your situation sits.
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Can cancer be transmitted? Is it a parasite or a virus?
No. Cancer is not contagious and does not spread from person to person. Some viruses and bacteria that raise cancer risk can pass between people, but the cancers they cause cannot. Cancer is not a parasite either: it is the body’s own cells growing out of control [14].
Could medical cannabis fit into your cancer care?
Twelve short questions about your diagnosis, treatment, symptoms and medicines. You get a plain summary of what the research says for a situation like yours and what to bring to your oncologist.
12 questions · about a minute · your answers stay in this browser
How does cannabis work in the body?
Cannabis works through the endocannabinoid system, a signaling network your body already has. It helps regulate pain, nausea, appetite, mood, sleep and immune activity, which is exactly why cannabinoids are studied for the symptoms of cancer and its treatment [3].
How it works in general, not a treatment claim.
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1
Receptors and the compounds that fit them
Cannabinoids attach to receptors like a key in a lock. CB1 receptors sit mostly in the brain and nerves, where they change pain and nausea signals. CB2 receptors sit mostly on immune cells.
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2
THC and CBD act differently
THC causes the “high” and drives most effects on nausea, appetite and pain. CBD does not cause a high and acts on other targets. A result found for one does not carry over to the other.
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3
The form changes the path
Inhaled cannabis reaches the blood within minutes. Swallowed products pass through the liver first, start later and last longer, and that liver step is where many drug interactions happen.
The two main compounds also shape each other. A 2025 systematic review and meta-analysis of cannabinoids for cancer symptoms notes that CBD tapers down the psychoactive effect of THC, which is one reason many products and trial medicines combine them [3]. Food matters too: a high-fat meal can raise how much CBD the body absorbs by up to four times [15], so the same product can feel different with and without a meal.
Other plant compounds, such as terpenes, may add to these effects, but how much they matter in people is not yet known.
Symptom relief: where is the evidence stronger?
The strongest human evidence is for chemotherapy nausea. Pain, appetite, sleep and mood have been studied too, with weaker or mixed results. This table shows what was tested and what kind of study tested it.
| Symptom | What was tested | Type of evidence | Source |
|---|---|---|---|
| Chemotherapy nausea and vomiting | Oral THC:CBD extract added to standard anti-nausea medicines, against placebo | Randomized trial | [1][2] |
| Cancer pain | Cannabinoids for cancer-associated symptoms, pooled across studies | Mixed results | [3] |
| Overall symptom burden in advanced cancer | 1:1 THC:CBD oil against placebo in palliative care | Randomized trial | [16] |
| Anxiety and depression | Products taken by mouth vs. other forms in a state medical cannabis program | Observational | [5] |
| Joint and muscle pain from breast cancer hormone therapy | CBD in a small pilot study without a placebo group | Mixed results | [17] |
| Dry mouth, swallowing and well-being in head and neck cancer | Supportive-care use summarized in a narrative review | Mixed results | [7] |
Does cannabis help with chemotherapy nausea?
For some people, yes, when it is added to standard anti-nausea medicines rather than used instead of them. Two placebo-controlled trials point the same way.
Nausea score with THC:CBD vs. placebo
2.11 vs 2.99 [1]
Average nausea score on THC:CBD extract compared with placebo, in a randomized, double-blind crossover trial of 54 women receiving chemotherapy. The extract was taken on top of standard nausea prevention; a lower score means less nausea [1] (2023).
A phase II/III randomized trial of oral THC:CBD in people whose nausea continued despite standard medicines found a complete response about three times as often as with placebo: RR 3.0, likely range 1.0 to 7.0 [2] (2024).
Both trials were small, and the lower end of the second range touches “no difference.” Talk with your oncologist before adding anything to your anti-nausea plan.
Dronabinol and nabilone, two prescription cannabinoid medicines, are already FDA-approved for nausea from chemotherapy [4]. The difference between those and products from a dispensary is explained further down.
Can cannabis help with cancer pain?
Possibly a little, for some people, but the evidence is weak. A 2025 systematic review and meta-analysis found a signal for lower cancer-associated pain, rated the certainty of that evidence as very low, and recorded more psychiatric, neurological and stomach side effects with THC-heavy products [3]. Cannabis is best thought of as a possible add-on to a pain plan your care team manages, not a replacement for it.
If you take opioids, the combination can deepen drowsiness and slow thinking. Bring this up before you start, not after.
Why do people with cancer lose appetite, and can cannabis help?
Appetite loss comes from nausea, taste changes, pain, low mood and cachexia, the wasting syndrome described above [10]. THC is known to stimulate appetite, and dronabinol is FDA-approved for appetite loss with weight loss in people with AIDS [4]. For cancer-related weight loss, the human data in our sources is still too thin to promise results. Read more about appetite loss and medical cannabis.
Sleep, anxiety and quality of life
Here the picture is honest but uneven. In a long-term cohort of people with cancer in a state medical cannabis program, those who took products by mouth reported greater improvement in anxiety (mean difference 1.53 points, likely range 1.38 to 1.68) and depression (1.36 points, 1.22 to 1.51) than those who did not [5] (2025). This was an observational study, so it shows a link, not proof that cannabis caused the change.
A randomized trial gives the counterweight. In advanced cancer, a 1:1 THC:CBD oil did not improve the overall symptom distress score compared with placebo: the difference was −0.33 points, p = 0.91 [16] (2025). A neutral result like this is as important to know as a positive one.
Low risk: side effects in the trials were mostly manageable
In the nausea trials, the most common complaints were dizziness and sleepiness, which most participants tolerated [1]. Effects still depend on the person, the product and the other medicines you take.
Cannabis and cancer: what does the research say?
Research on cannabis and cancer splits into two very different questions. Can it ease symptoms? There are human trials, and some are encouraging. Can it treat the cancer itself? So far that evidence comes from lab dishes and animals, not from people. The table runs from the strongest claim to the weakest.
| Claim | Type of data | How strong |
|---|---|---|
| Relieves chemotherapy nausea when added to standard medicines | Randomized trials in people [1][2] | Moderate |
| Eases cancer pain | Systematic review and meta-analysis [3] | Very low certainty |
| Improves overall symptom burden in advanced cancer | Randomized trial, no difference from placebo [16] | Not shown |
| Improves appetite and weight in cancer | Prescription THC approved for other conditions; little cancer data [4] | Unclear |
| Slows or kills tumors | In lab and animal studies only [6][15] | Not tested in people |
| Lowers cancer risk | Observational studies only; links, not causes [18] | Not shown |
An ASCO Educational Book review of integrative oncology for gastrointestinal cancers places cannabinoids where the evidence puts them: as one option for symptoms, used alongside standard care and discussed with the oncology team [19].
Explore the studies behind this page
Pick a study type to see how much of what you may have heard was actually tested in people. Neutral and negative results are shown as plainly as positive ones.
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Oral THC:CBD for chemotherapy nausea that standard medicines did not control
Adults whose nausea and vomiting continued despite guideline anti-nausea medicines, THC:CBD capsules vs. placebo.
Complete response was more likely with THC:CBD: RR 3.0 (likely range 1.0 to 7.0) [2].
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THC:CBD extract added to standard nausea prevention
54 women receiving chemotherapy, each tried both extract and placebo [1].
Average nausea score 2.11 with extract vs. 2.99 with placebo; dizziness or sleepiness in 36 of 54 [1].
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1:1 THC:CBD oil for symptom control in advanced cancer
Adults with advanced cancer receiving palliative care, oil vs. placebo.
No difference in overall symptom distress: −0.33 points, p = 0.91 [16].
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Cannabinoids for the palliation of cancer-associated symptoms
Pooled studies of cannabinoids for pain, anxiety and other symptoms.
A signal for pain and anxiety relief, more side effects with THC-heavy products; certainty very low [3].
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Medical cannabis in supportive care for head and neck cancers
Summary of supportive-care use in a group with heavy treatment side effects.
Possible help with symptoms, plus warnings on liver-enzyme interactions and blood thinners [7].
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Cannabinoids and outcomes on immune checkpoint inhibitors
People receiving immunotherapy, such as PD-1 inhibitors.
Mixed findings: some studies link cannabis use with poorer outcomes, so timing and use need a talk with the oncologist [20].
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Integrative oncology for gastrointestinal cancers
Guidelines and evidence on complementary approaches in GI cancer care.
Places cannabinoids among symptom options used alongside, not instead of, standard treatment [19].
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CBD for joint and muscle pain from aromatase inhibitors
Postmenopausal women with breast cancer on hormone therapy; no placebo group.
Mixed results; CBD may also lower blood levels of anastrozole through the CYP3A4 liver enzyme [17].
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Cannabis, anxiety and depression in a state medical program
People with cancer followed over time in a medical cannabis program.
Anxiety and depression improved more with products taken by mouth; a link, not proof [5].
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Cannabis use, opioid use and complications after cancer surgery
A small group of adults having abdominal cancer surgery, regular users compared with non-users.
Complications were recorded in 5 of 23 users and 21 of 41 non-users; the study was too small to show cause, and its overall result was not in favor of cannabis [21].
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Cannabis use disorder and pancreatic cancer in chronic pancreatitis
Health records of people with chronic pancreatitis, with and without cannabis use disorder.
Pancreatic cancer was recorded less often (HR 0.263), but pancreatitis flares more often (HR 1.102). An association, not a cause [18].
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MedCan 3: THC/CBD 1:20 for symptom burden in cancer
A placebo-controlled trial planned for 150 participants [22].
Results not yet published [22].
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Cannabinoids against gliomas
Recent research on brain tumors, almost all in cells and animals.
Anti-tumor effects in lab and animal studies; evidence certainty very low and not tested as treatment in people [6].
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CBD in gliomas and new ways to deliver it
Lab and animal research on CBD and drug carriers.
In lab models, CBD added to temozolomide’s effect on tumor cells; no proof of benefit in patients [15].
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Cannabinoids and cervical cancer treatment
Preclinical studies combining cannabinoids with chemotherapy.
In lab studies, effects alongside cisplatin; a lab-based concern that cannabinoids could dampen immune cells that immunotherapy relies on [23].
Cannabis and specific cancer types: what has been studied
For most cancer types, research on cannabis is still in the lab. Where people were studied, it was usually for symptoms or side effects of treatment, not for the tumor. Here is where each type stands.
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Glioma and other brain tumors
Lab and animal studies
Brain tumors are the most studied type. In lab and animal studies, CBD and THC slowed tumor cells and added to the effect of temozolomide and radiation [6][15]. None of this has been shown as a treatment in people.
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Breast cancer
Small clinical study
A pilot study tested CBD for the joint and muscle pain that aromatase inhibitors can cause. Results were mixed, and CBD may lower anastrozole levels, which makes this a question for your oncologist [17].
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Head and neck cancers
Review of supportive care
Treatment here often brings mouth pain, dry mouth and trouble swallowing. A review describes cannabis as a possible part of supportive care, with care around drug interactions [7].
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Pancreatic cancer
Observational
In people with chronic pancreatitis, those with cannabis use disorder had pancreatic cancer recorded less often (HR 0.263, likely range 0.202 to 0.344) but more pancreatitis flares (HR 1.102) [18]. This is a link in health records, not a cause, and not a reason to use cannabis.
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Cervical cancer
Lab studies
A review of preclinical work describes effects of cannabinoids on cervical cancer cells and alongside cisplatin in the lab [23]. Human data is lacking.
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Gastrointestinal cancers
Clinical review
An ASCO review of integrative oncology for GI cancers covers cannabinoids as a symptom option within standard care [19].
Key takeaway
No cancer type has human evidence that cannabis cures it or shrinks it. What people were studied for is symptom relief during treatment.
Ways to use cannabis during cancer treatment: what matters for each form
Cannabis is not the same thing as smoking it. Edibles, capsules, tinctures, sprays, creams and patches all exist, and each one changes what you need to think about during treatment. It helps to sort the risks into three layers.
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1. Smoke and vapor
Smoke and hot vapor pass over the mouth, throat and lungs. That matters with mouth sores from chemotherapy, radiation to the head, neck or chest, or lung cancer. The CDC notes that smoked cannabis, however it is smoked, can harm lung tissue and blood vessels [24].
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2. Any form
Whatever the form, THC still acts on the brain, swallowed and held products still pass through the liver, and interactions, drowsiness and impaired driving still apply [7]. Choosing a form without smoke does not remove these.
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3. Shared devices
A shared joint, pipe or vape passes germs between people. When chemotherapy lowers your white blood cells, infections can become dangerous quickly [12].
| Form | How it enters | Starts and lasts | What it avoids | What still applies |
|---|---|---|---|---|
| Smoking: joints, pipes, bongs | Burned plant, through the lungs | Within minutes; shorter | The liver’s first pass | Smoke on mouth, throat and lungs; THC effects; interactions |
| Vaping and dabbing | Heated aerosol, through the lungs | Within minutes; shorter | Burning | Hot aerosol on the same airways; strong concentrates; interactions |
| Edibles, beverages and capsules | Swallowed, through the gut and liver | Later; longer | Smoke and vapor; shared mouthpieces | Delayed effect, liver processing, interactions, drowsiness |
| Tinctures, oils and mouth sprays | Under the tongue or inside the cheek; part is swallowed | In between; varies | Smoke and vapor | The swallowed part passes through the liver; interactions |
| Topicals and patches | Creams act on the skin; patches reach the blood | Varies by product | Smoke, vapor and the gut | Patches still carry cannabinoids into the blood; skin on radiation sites |
| FDA-approved prescriptions | Capsules or oral solution | Set by the label | Unknown product content | Prescription medicine with its own label; see below |
Moderate risk: edibles act late
Swallowed cannabis can take a long time to start working. Taking a second dose because “the first one didn’t work” is a common cause of taking too much. Which form fits your treatment is a question for your doctor, not for this page.
FDA-approved cannabinoids vs. medical cannabis: what’s the difference?
Prescription cannabinoids are FDA-approved medicines with a fixed dose; medical cannabis is a plant product you buy at a licensed dispensary with a state card. Both can be part of cancer care, and they are not interchangeable [4].
| Aspect | Prescription: dronabinol (Marinol, Syndros), nabilone (Cesamet) | Medical card products |
|---|---|---|
| What it is | Synthetic THC (dronabinol) or a THC-like compound (nabilone) in a fixed dose | Plant-based products with varying THC, CBD and other compounds |
| Approved uses | Nausea and vomiting from cancer chemotherapy; dronabinol also for appetite loss in AIDS [4] | Not FDA-approved; state programs list the conditions they cover |
| How the dose is set | By the prescriber, following the label | Discussed with the recommending physician; product labels and lab tests guide content |
| Insurance | May be covered like other prescriptions | Usually paid out of pocket |
| How you get it | Prescription filled at a pharmacy | Physician recommendation, state registration where required, then a licensed dispensary |
Many people find it useful to raise both options at the same visit. Ask your oncologist whether a prescription cannabinoid makes sense for your nausea or appetite, and if you are considering medical cannabis, how it would fit with your other medicines. Two prescription options sit next to each other here because they are the only ones the FDA has approved for these uses; no other cannabis or CBD product on the market is FDA-approved [4].
What science doesn’t know yet: limitations and evidence gaps
A lot is still not yet known, and saying so plainly is part of a fair answer. These are the main limitations and evidence gaps, and each one needs further research before anyone can promise more.
- The newest trials are not finished. MedCan 3, a placebo-controlled trial of THC/CBD 1:20 for cancer symptom burden, has published its plan but not its results [22].
- The nausea trials were small. In one, patients’ starting nausea scores were low, around 2 out of 10, and the authors point to possible placebo effects and fixed doses as limits [1].
- There are no standard doses for people with cancer. Trials used different products, ratios and schedules, so their results cannot simply be added together [3].
- Most anti-tumor research has not reached people. Much of it is in cells and animals, and some lab work has never been tested in living organisms [6].
- Effects on immunotherapy are unsettled. Findings so far are mixed and largely based on lab models and retrospective data [20][23].
What kinds of studies are behind these findings?
How to read it: each row is one type of study. The bar length and the number on the right show how many published works of that type exist on cannabis and cancer. Types near the top are better at showing cause and effect; gray rows are studies without patients.
Show as a table
| Type of study | Published works | Includes patients |
|---|---|---|
| Meta-analyses and systematic reviews | 60 | Summarizes other studies |
| Randomized trials | 44 | Yes |
| Other clinical trials | 36 | Yes |
| Cohort and case-control studies | 216 | Yes |
| Surveys and cross-sectional studies | 211 | Yes |
| Case reports | 58 | Yes |
| Narrative reviews and guidelines | 624 | Summarizes other studies |
| Animal studies | 160 | No |
| Cell studies | 405 | No |
The future of cannabis and cancer care
The next few years should bring clearer answers on symptoms rather than headlines about cures. Research is moving toward larger placebo-controlled trials for chemotherapy nausea, appetite loss and cachexia, and symptom control in palliative care, with standardized products whose THC and CBD content is known. Researchers are also asking how cannabinoids interact with immunotherapy and other cancer drugs, a question that matters for many people in treatment today [20].
Trials to watch
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MedCan 3
What it tests: an oral THC/CBD 1:20 product against placebo for overall symptom burden in people with cancer, planned for 150 participants [22].
Status: protocol published; results not yet published.
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1:1 THC:CBD in palliative care
What it tests: a balanced THC:CBD oil against placebo for symptom burden in advanced cancer [25].
Status: completed; no difference from placebo on the main symptom score [16].
Until those answers arrive, the most useful step is the same as today: an open conversation with your care team about what you hope cannabis might help with and what you already take.
Safety and side effects: what to watch for
Most side effects reported in cancer studies were mild to moderate, but THC and CBD cause different ones, and smoke adds its own. The table sorts them by what they were reported with.
| Effect | Reported with | Note |
|---|---|---|
| Dizziness or sleepiness | THC:CBD | Reported by 36 of 54 participants in a chemotherapy nausea trial [1] |
| Drowsiness, dry mouth, slowed thinking, euphoria | THC | Common; avoid driving while affected [3] |
| Fatigue, diarrhea, appetite changes | CBD | Common in CBD studies [3] |
| Anxiety, paranoia, confusion, mood changes | THC-heavy products | More likely with higher THC and in people with psychiatric history [3] |
| Fast heartbeat, higher blood pressure | THC | Matters with heart disease; trials excluded people with unstable heart conditions [22] |
| Cough, throat and lung irritation | Smoking and vaping only | Not from edibles, tinctures or topicals [24] |
When nausea gets worse: cannabinoid hyperemesis syndrome
Some people who use cannabis heavily over a long time develop cycles of severe nausea and vomiting, often eased for a while by hot showers. This is cannabinoid hyperemesis syndrome. It can look like ordinary chemotherapy nausea, so if your nausea keeps getting worse while you use cannabis, tell your care team. Stopping cannabis is what resolves it.
Call your care team right away if
Cannabis and your cancer treatment: interactions to discuss with your oncologist
Cannabis can change how other medicines work, mostly through the liver enzymes that break drugs down. Some of these interactions are known from patients, some from drug chemistry, and some only from the lab. Each card says which.
Opioids, antidepressants and chemotherapyDrug-level
Cannabis can act on liver enzymes (the CYP family) that process many drugs, which can raise or lower their levels in the blood [7]. With opioids, extra drowsiness adds to that.
CYP3A4 drugs, such as anastrozoleDrug-level
CBD blocks the CYP3A4 enzyme, which could lower blood levels of anastrozole, a breast cancer hormone therapy, or change other medicines that use the same pathway [17].
Warfarin and other blood thinnersClinical
Buprenorphine and tacrolimusClinical
Both were flagged as possible interactions that need monitoring in people with cancer using medical cannabis [5].
Immunotherapy (PD-1 inhibitors)Lab
Chemotherapy and radiation in lab modelsLab
How to bring it up with your oncologist
Many patients worry the topic will be brushed off. It usually helps to come prepared, so the conversation is about your treatment and not about cannabis in general.
- Bring a list of every medicine and supplement you take, including over-the-counter ones.
- Say which form you use or are considering, and how often.
- Name the symptom you hope it helps: nausea, pain, appetite, sleep or worry.
- Mention the date of your next chemotherapy, immunotherapy or surgery.
- Ask whether it is safe for you to drive, and on which days.
Who should avoid cannabis during cancer care?
For some people the risks outweigh any likely benefit, and clinical trials leave them out on purpose. If one of these describes you, talk with your oncologist before using any cannabis product.
High risk: when cannabis is the wrong step right now
A fever during chemotherapy, vomiting you cannot stop, pain that is suddenly out of control, or new confusion all need your oncology team or emergency care first. Cannabis never replaces or delays chemotherapy, radiation, surgery or immunotherapy: delaying proven treatment can have serious consequences.
Is cancer a qualifying condition for a medical marijuana card?
In most state medical cannabis programs, yes: cancer is named directly on the list of qualifying conditions. Some states list it through its symptoms instead, such as severe nausea, chronic pain or cachexia (wasting). Each state writes and updates its own list, so the exact wording depends on where you live [26].
What usually counts is a documented diagnosis, current or past, and symptoms that affect your daily life. You do not need to be in active treatment, and a card does not replace anything your oncologist prescribes. Rules on registration, possession and renewal are set by your state; our overview of state cannabis laws collects them in one place.
To prepare for the evaluation, keep these at hand:
- Your diagnosis in writing: a pathology report, an oncology visit summary or a discharge note.
- A list of current medicines, including chemotherapy, immunotherapy, pain relievers and blood thinners.
- The symptoms you want help with, and what you have already tried.
Not sure what happens during the appointment? Read how the evaluation works.
How to get a medical marijuana card for cancer
You can do it from home in four steps. Two of them are ours to keep short; the last one belongs to your state.
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Step 1
Fill out a short form
Tell us your state, your diagnosis and your symptoms. It takes about five minutes.
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Step 2
Meet a physician licensed in your state
A one-on-one appointment of about fifteen minutes, all online. You agree on the time with the doctor; keep the hour free, not just the minute.
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Step 3
Receive your signed recommendation
If the doctor finds you qualify, the signed recommendation usually arrives within 24 to 48 hours after the appointment.
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Step 4
Register with your state program
Where your state requires registration, you submit the recommendation to the state program. Review times are set by the state agency.
After you book
You will get a confirmation email; if it is not in your inbox, check the spam folder. Your recommendation and appointment details stay in your account and documents, so you can find them again when you register with the state or renew.
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
Questions about the process are answered in our medical card FAQ. Veterans can read about support for veterans, and people on a limited income can see our low-income program.
Renewing your card during ongoing cancer care
Cards expire, and treatment often lasts longer than one card. How long a card is valid and how renewal works are set by each state, so check the date on yours and your state’s rules ahead of time.
Renewal is a new evaluation, which makes it a good moment to update the doctor. If your treatment has changed since the last visit, say so: a new chemotherapy, the start of immunotherapy, surgery coming up, or new medicines such as blood thinners or opioids. The interactions above can shift with each change.
Lost or damaged card? Here is what to do if your medical card was lost.
Set a reminder a month before your card expires
Treatment weeks are unpredictable. A month gives you room to schedule the appointment around infusions and recovery days.
How state medical programs and dispensaries work
A medical cannabis program is run by your state. A physician’s recommendation shows you qualify; in many states you then register with the program and receive a patient card, which lets you buy from licensed dispensaries within the state’s limits [26]. Many programs also allow a registered caregiver to buy on behalf of a patient who cannot go alone; the rules for this are part of each state’s law.
Buy only from dispensaries licensed by your state, which publishes them through its program. Licensed products are labeled with their THC and CBD content and tested by a lab, which matters more when your immune system is weakened.
Traveling? Some states honor cards from other states, many do not; see which states accept out-of-state medical cards and traveling with medical cannabis. Medical patients may also pay different taxes than recreational buyers: medical vs. recreational cannabis taxes.
What to ask at the dispensary
- How much THC and CBD is in this product, and in what ratio?
- What form is it, and is there a version without smoke?
- Can I see the lab test for this batch?
- How long does it take to start working, and how long does it last?
Legal protections: employment, firearms, privacy and disability
A medical card protects you under state law, while federal law still treats cannabis differently. Here is what that means for the questions people with cancer ask most.
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Is cancer a disability?
Often, yes. Under the Americans with Disabilities Act, people who currently have cancer, or have cancer in remission, should easily qualify as having a disability, which can entitle you to reasonable accommodations at work [27]. Social Security disability has its own rules for cancer [28].
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Work and drug tests
Workplace protections for card holders depend on your state. Some states bar firing a registered patient for a positive test alone; others let employers keep drug-free rules. Check your state’s laws before you assume either way.
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Firearms
The federal firearms purchase form asks whether you use marijuana, and federal law still treats it as an unlawful drug, even with a state card. This is one area where state protection does not reach. An example: owning guns with a medical card in Ohio.
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Your privacy
Your health information is protected by HIPAA, the federal privacy law for medical records [29]. State patient registries are generally confidential and not open to the public; your employer does not see them.
Cannabis and cancer: questions patients ask
About cannabis and cancer
Can cannabis cure cancer?
No. There is no human evidence that cannabis or cannabinoids cure cancer. Anti-tumor effects have been seen only in lab and animal studies, which often do not hold up in people [6][15]. Cannabis should never replace or delay chemotherapy, radiation, surgery or immunotherapy. What it may offer is relief from some symptoms during treatment.
Is cannabis safe for cancer patients?
For many people, side effects are manageable: dizziness and sleepiness were the most common in a chemotherapy nausea trial [1]. But cannabis can interact with chemotherapy, opioids, antidepressants and blood thinners through liver enzymes [7], and it is not advised with unstable heart disease, severe liver problems, pregnancy or certain psychiatric conditions. Safety depends on your situation, so ask your oncologist.
Can cannabis help manage cancer-related symptoms?
For some symptoms and some people, yes. The best evidence is for chemotherapy nausea when cannabis is added to standard medicines [2]. Evidence for pain is of very low certainty [3], and a trial in advanced cancer found no overall difference from placebo [16]. Think of it as a possible add-on to your care plan, not a fix.
Are CBD and THC different in cancer treatment?
Yes. THC causes the high and drives most effects on nausea, appetite and pain, along with drowsiness and confusion. CBD does not cause a high, tapers down THC’s psychoactive effect [3], and has its own side effects such as fatigue and diarrhea. CBD also blocks a liver enzyme that processes some cancer drugs [17]. Results for one do not apply to the other.
Can cannabis interact with my cancer treatment?
Yes, it can. Cannabis affects liver enzymes that process many chemotherapy drugs and supportive medicines [7]. CBD may lower levels of anastrozole [17], and some studies link cannabis use during immunotherapy to poorer outcomes [20]. Share everything you take with your oncologist; the interactions section lists what to raise.
What are the side effects of cannabis in cancer patients?
The most common are dizziness, sleepiness, dry mouth and slowed thinking with THC, and fatigue, diarrhea or appetite changes with CBD. THC-heavy products can also cause anxiety, paranoia or a fast heartbeat [3]. Smoke and vapor add cough and throat irritation. Report any side effect to your care team, especially confusion or vomiting that will not stop.
Should I discuss cannabis use with my doctor?
Yes, always, and ideally before you start. Your oncologist knows your treatment schedule, blood counts and other medicines, which are exactly the things that decide whether cannabis is safe for you. Bring a full medicine list and the symptom you want help with; the five questions above make the talk easier. Doctors hear this question often.
Is it safe to use cannabis to help with pain while on opioids?
It can be, under medical supervision, but the combination adds drowsiness and slowed thinking, and cannabis can change how the liver handles opioids [7]. Evidence that cannabis improves cancer pain is of very low certainty [3]. Never lower your opioid dose on your own; changes to a pain plan belong with the doctor who manages it.
Are there specific types of cancer that respond better to cannabinoids?
Not in people. Brain tumors such as glioma are the most studied, but almost entirely in cells and animals [6]. No cancer type has human evidence that cannabinoids treat the tumor. Where people were studied, it was for symptoms and side effects, which you can see by type in the specific cancer types section.
Are there risks to using cannabis that can be passed down to future generations?
This is not settled. Some researchers suggest heavy, long-term THC use might affect sperm and eggs, but evidence in people is limited. What is clear is that cancer trials ask participants to avoid pregnancy, breastfeeding and fathering a child while taking cannabinoids [22]. If you are planning a family after treatment, ask your oncologist or a fertility specialist.
Does cannabis help with chemo nausea?
It helped some people in trials when added to standard anti-nausea medicines: average nausea scores were 2.11 with a THC:CBD extract against 2.99 with placebo [1]. Two prescription cannabinoids, dronabinol and nabilone, are FDA-approved for chemotherapy nausea [30]. Talk to your oncologist before changing your nausea plan.
Is it safe during chemotherapy or immunotherapy?
It depends on your drugs and your blood counts. During chemotherapy the main concerns are liver-enzyme interactions and infection risk when white cells are low [7]. During immunotherapy, lab work suggests cannabinoids may dampen immune cells, and patient studies are mixed [23][20]. Ask your oncologist about timing before you start.
Is delta-8 THC the same as medical cannabis?
No. Delta-8 THC products are usually made by chemically converting CBD and are sold outside state medical programs, often without the testing and labeling licensed dispensaries require. The FDA has not approved them, and no cannabis product other than the prescription medicines described above is FDA-approved [4]. They were not what the cancer trials on this page tested.
Does cancer have a cure?
Many cancers can be cured, especially when found early, with surgery, radiation, chemotherapy, targeted therapy or immunotherapy. Others cannot be cured but can be controlled for years. There is no single cure for all cancers, because cancer is many different diseases. Your oncologist can explain what the goal of your treatment is.
About the card
Is cancer a qualifying condition in my state?
In most states with a medical program, cancer is listed directly; in others it qualifies through symptoms such as severe nausea, chronic pain or wasting [26]. Each state keeps its own list. A licensed physician in your state checks this during the evaluation, and our state laws overview shows the rules where you live.
Can I use my card in another state?
Sometimes. Some states accept out-of-state medical cards, some accept them only with a local registration, and many do not accept them at all. Crossing state lines with cannabis remains illegal under federal law. Before you travel for treatment, check which states accept out-of-state cards.
What if I lose my card?
Contact your state program to request a replacement; most handle it online. Your physician’s recommendation stays in your account, so you do not need a new evaluation just because the card is lost. Step-by-step help is in our guide on what to do if your card was lost.
How long after the appointment do I get my recommendation?
Usually within 24 to 48 hours after the appointment, if the physician finds that you qualify. The appointment itself is a telemedicine visit with a doctor licensed in your state, held online so you do not have to travel during treatment. State registration, where required, follows on the state’s own timeline.
Cancer support resources and the latest news
Medical cannabis is one small part of living with cancer. These trusted resources cover the rest, from finding a cancer center to finding people who understand.
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Find a cancer center
The National Cancer Institute keeps a directory of NCI-Designated Cancer Centers [31], organized by state, for treatment and clinical trials near you, including hematology and oncology centers. Its Cancer Information Service answers questions at 1-800-4-CANCER.
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Support communities and helplines
The American Cancer Society [32] and the Cancer Support Community [33] offer patient guides, support groups and help for families, in person and online.
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Cancer awareness months and ribbon colors
Most cancers have an awareness month and a ribbon color, such as pink for breast cancer in October. Patient organizations like the American Cancer Society [32] use them for screening reminders and fundraising.
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Latest cannabis news
Law changes, new state programs and research headlines, summarized for patients in our cannabis news section.
Other conditions people ask about
Symptoms of cancer and its treatment overlap with other conditions we cover in depth.
How else can we help you?
If you take three things from this page, take these.
Symptom relief, not a cure. The evidence is about nausea, pain, appetite and sleep during treatment.
Check safety and interactions first. Your medicines and blood counts decide what is safe.
Decide with your oncologist. Cannabis works alongside your treatment plan, never instead of it.
Talk to a physician licensed in your state
About five minutes online, then about fifteen minutes with the doctor.