Medical Cannabis for Headache: What the Evidence Shows
Cannabis for headache has been studied far less than most people assume: a few small studies in people, case reports and lab work in mice, and no large trial for any headache type. Smoke and vapor add their own strain on the airways. Any form, inhaled, eaten, held under the tongue, acts on the brain and can interact with headache medicines, so the choice of form and whether to use it at all belongs with a physician.
Built on peer-reviewed research: observational studies in people, case reports, reviews and laboratory work
When headaches keep coming back: why the usual pills stop working
One bad headache is an afternoon lost. A headache that returns week after week is something else: missed shifts, plans canceled at the last minute, evenings spent in a dark room, and nights when the pain is the reason you wake up. Many people carry it quietly for months because each single episode does not feel serious enough to bother a doctor.
Then the pills start to do less. Painkillers taken on many days of the month can keep the cycle going on their own: the brain gets used to them, and a new headache arrives as each dose wears off. Doctors call this medication-overuse headache, or rebound headache. It is common, it is treatable, and it is one of the first things a physician looks for when headaches become frequent.
Getting help can feel like another obstacle. Appointments are weeks away, the waiting room is the last place you want to sit with a pounding head, and asking about cannabis can feel awkward. A conversation with a licensed physician online removes the waiting room. It does not promise a result; it gives your headaches the attention of someone who reviews them properly.
How often do you reach for a painkiller?
Count the days in a typical month; the answer is the same thing a doctor will ask.
A few days a month. Occasional headaches that ease with an over-the-counter dose are the most common pattern. Keep a short note of when they happen; if they change character or start coming more often, that note is what a doctor will want to see.
About once a week. This is the point where a pattern is worth looking at. Triggers such as short sleep, skipped meals, screen-heavy days or neck strain often show up once you write the days down, and a physician can talk through prevention rather than one dose at a time.
Most days. Taking painkillers on most days can itself keep headaches coming back: the rebound pattern described above. This is not a diagnosis and not a reason to stop a prescribed medicine on your own. Bring this count to your doctor; it changes what they look for first.
What kind of headache is it? Types and how common they are
A headache is pain anywhere in the head or upper neck. Doctors sort headaches into two large groups, and the difference matters more than the strength of the pain: in one group the headache is the illness itself, in the other it is a signal of something else that needs its own care.
Primary headaches
What it is: the headache itself is the condition; scans and blood tests usually come back normal.
Common examples: tension-type headache, migraine, cluster headache and its rarer relatives.
What it tells you: the goal is managing attacks and preventing them, often over years.
Secondary headaches
What it is: a symptom of another cause that a doctor can often find and treat.
Common examples: a head injury, a stiff or injured neck, very high blood pressure, an infection, or stopping a medicine or caffeine.
What it tells you: treating the cause is what ends the headache.
Tension-type headache, a tight band of pressure on both sides, is the everyday kind most people know. Migraine is a separate neurological condition with throbbing pain, sensitivity to light and sound and often nausea; it has its own page: migraine and medical cannabis.
Does headache location mean anything?
Location is a clue, not a diagnosis. Certain headache types favor certain areas, so where it hurts helps a doctor decide what to ask next. But the same spot can belong to several types, and many headaches move or spread during an attack. What matters as much as the place is how the pain starts, how long it lasts and what comes with it.
Where does it hurt most?
Pick the closest; many headaches move or spread.
| Where it hurts | Often linked with | See a doctor soon if |
|---|---|---|
| Behind the eyes (left or right eye) | Migraine, tension-type headache, eye strain; cluster headache when it is always one side, severe and comes with a watery eye or runny nostril. | Vision blurs or doubles, the eye turns red and painful, or attacks wake you at the same hour each night. |
| Behind the right eye and temple | Cluster headache and migraine, which both tend to stay on one side; tension-type headache less often. | It is the first headache of this kind, it is the worst you have had, or the drooping eyelid or tearing does not settle between attacks. |
| Temple | Tension-type headache and migraine; jaw clenching. In older adults, giant cell arteritis (GCA), an inflamed artery in the temple. | You are older and the temple is tender to touch, your jaw aches when chewing, or your vision changes: same day. |
| Front of head | Tension-type headache, migraine, caffeine withdrawal, sinus congestion. | It comes with fever, swelling around the eyes, or it keeps returning on most days. |
| Between the eyebrows | Sinus pressure during a cold or allergy flare, tension-type headache, migraine (which is often mistaken for a sinus headache). | Fever, thick discharge or facial swelling last more than a few days, or the pain is getting worse rather than better. |
| Back of head and neck | Tension-type headache; cervicogenic headache, which starts in the neck and spreads up; poor posture and long screen days. | It follows a fall or injury, the neck is stiff with a fever, or it is worse every time you cough or strain. |
| Jaw, neck and dizziness together | Jaw joint problems and teeth grinding, cervicogenic headache, migraine with dizziness. | You are older and chewing makes the jaw ache, or dizziness comes with weakness, slurred speech or vision loss. Call 911 for those. |
| Whole head | Tension-type headache, migraine, dehydration, medication-overuse headache, a hangover or caffeine withdrawal. | It is new and getting steadily worse over days, it is worst on waking, or it starts suddenly at full strength. |
When it happens tells a doctor more: mornings, standing up, coughing, after a head injury
The timing of a headache often says more than its place. A headache that is always there on waking, one that changes with posture, or one set off by a cough points a doctor in very different directions. These are the situations people search for most, with what each one usually means.
Headache every time I wake up
Common causes are short or broken sleep, teeth grinding at night, a drink the evening before, caffeine wearing off overnight, and snoring with pauses in breathing (sleep apnea). Rebound from evening painkillers can also show up first thing. A morning headache that is new, worsens over days, or comes with vomiting needs a doctor this week, and the same day if it is severe.
Headache every time I stand up, and better lying down
A headache that builds when you are upright and fades when you lie flat can come from low pressure of the fluid around the brain, sometimes after a spinal tap, an epidural or even without a clear reason. Dehydration and a drop in blood pressure on standing feel similar but milder. This one needs a same-week visit; the opposite pattern, a headache that gets worse when you lie down, deserves the same.
Headache that hurts when I cough or bend over
Pain that spikes with a cough, a sneeze, straining or bending forward is often harmless and short-lived, and a stuffed sinus makes bending over hurt too. But a first-time cough headache should be checked, because a small share of cases have a structural cause a scan can find. This one needs a same-week visit, sooner if it comes with dizziness or numbness.
How long does a concussion headache last?
Most headaches after a concussion ease over days to a few weeks as the brain recovers; some last for months and are then called persistent post-traumatic headache. Rest at first, then a gradual return to activity, is the usual advice. A headache that worsens after a head injury, repeated vomiting, confusion or growing drowsiness is an emergency. More on this in brain injuries and medical cannabis.
How long does a cervicogenic headache last?
A cervicogenic headache starts in the neck and spreads to one side of the head. Attacks can last hours to days and tend to return while the neck problem is there. Moving the neck or holding one position makes it worse. A physical therapist or physician can confirm where it comes from; posture changes and neck exercises are usually the first step.
Headache with jaw pain, neck pain and dizziness
Together these often point to the jaw joint, teeth clenching or the neck, and migraine can bring dizziness too. In older adults, jaw pain while chewing with a new headache can be giant cell arteritis, which needs care the same day. Sudden dizziness with weakness, slurred speech or a drooping face is a stroke sign. Call 911.
Headache with ringing in the ears
Ringing in the ears (tinnitus) and headache often travel together in migraine, after loud noise, with jaw problems and with high doses of aspirin. A whooshing sound in time with your heartbeat, sudden hearing loss in one ear, or ringing that started after a head injury needs a same-week visit.
Does a headache mean high blood pressure, or high blood sugar?
Usually not. Raised blood pressure rarely causes a headache on its own; very high pressure in a hypertensive crisis can, and then it comes with chest pain, confusion, vision changes or shortness of breath. That is an emergency. High or low blood sugar can bring a headache along with thirst, shakiness or sweating. If you have a home monitor or glucose meter, write the reading next to the headache in your diary. More in headache, blood pressure and cannabis.
Headache red flags: when to call 911 or go to the ER
Most headaches are not dangerous. These are the exceptions, and with any of them the right place is the emergency room, not an online appointment or a cannabis product.
- A sudden, explosive headache that reaches full strength within a minute, the “worst headache of my life,” also called a thunderclap headache.
- Fever with a stiff neck, a new rash, or sensitivity to light that comes on with the headache.
- Weakness, numbness, slurred speech, vision loss or confusion, even if they pass within minutes.
- A headache after a head injury, especially with vomiting, growing drowsiness or a seizure.
- Headache with nausea and repeated vomiting – throwing up again and again, or a headache that keeps getting worse alongside it.
- A new headache in an older adult with jaw pain when chewing, a tender temple or changes in vision: possible giant cell arteritis (GCA), which can threaten sight.
- Very high blood pressure with a headache, chest pain, shortness of breath or confusion.
Call 911 or go to the nearest emergency room. Do not wait for an online appointment.
Do your headaches fit a conversation about medical cannabis?
Fourteen short questions about your headaches, your records and your medicines. Your answers stay on this page and show what to bring to a physician.
14 questions · about a minute · your answers stay in this browser
Headache home remedies for quick relief, and when they stop being enough
For an ordinary tension-type headache, the simplest steps are often the fastest, and none of them needs a prescription. They are also the steps a physician will ask whether you have tried, so it helps to know which ones work for you.
Water and a meal
Thirst and skipped meals are two of the most common triggers. A large glass of water and something to eat can take the edge off within the hour.
Rest in a dark, quiet room
Light and noise make many headaches worse, migraine above all. Lying down with your eyes closed for a short while helps the attack pass.
Cold or warm compress
A cold pack on the forehead or temples suits throbbing pain; warmth on the neck and shoulders suits tight, pressing pain.
Caffeine, with care
A cup of coffee can help an early headache. Daily heavy use works the other way: missing your usual cup brings on a withdrawal headache.
A steady sleep schedule
Too little sleep and sleeping in both set headaches off. Going to bed and getting up at the same time is one of the best long-term habits.
Gentle neck and shoulder movement
Slow stretches, a short walk and a break from the screen loosen the muscles behind a tension-type or neck-related headache.
Over-the-counter medicines and emergency treatments
Can I take aspirin for a headache?
Most adults can, for an occasional headache, at the dose on the label. Aspirin is not for children and teenagers, because of the risk of Reye’s syndrome, a rare but serious illness. It can irritate the stomach and cause bleeding, and it adds to the effect of blood thinners. If you have a stomach ulcer, bleeding problems, asthma triggered by aspirin, or take a blood thinner, ask a pharmacist or doctor first.
Can I take ibuprofen for a headache?
Ibuprofen and naproxen work well for many tension-type headaches and migraines. Take them with food, avoid them with kidney disease, stomach ulcers or late pregnancy, and keep to the label. Like any painkiller, they can drive rebound headaches when taken on many days of the month. If you also use cannabis, read what to know about mixing marijuana and ibuprofen.
Can I take headache medicine while pregnant?
Only after checking with your doctor or midwife. Some common painkillers are avoided in pregnancy, especially in the later months, and the choice depends on how far along you are. Cannabis in any form is not advised in pregnancy or while breastfeeding. A new or severe headache in pregnancy, especially with swelling or vision changes, needs a same-day call.
What is a headache cocktail?
It is the nickname for a combination of medicines given in an emergency room or urgent care, usually through an IV, when a severe migraine does not respond at home. It typically pairs an anti-nausea medicine with an anti-inflammatory and fluids, sometimes with other drugs chosen by the doctor. It is a hospital treatment, not something to copy at home.
Cluster headache: how much oxygen helps?
Breathing high-flow oxygen through a mask is a standard treatment for a cluster headache attack. The flow rate, the mask and how long to use it are set by the prescribing doctor, and home oxygen comes with a prescription and safety instructions: keep it away from flames and smoking. If you have cluster headaches and have not been offered oxygen, ask about it at your next visit.
Headache diary: a printable template to bring to your doctor
A headache diary turns “I get a lot of headaches” into something a doctor can work with: how often they come, how strong they are, what sets them off, and how many days a month you take something for them. At a medical cannabis evaluation it is the single most useful thing you can bring, because it shows the pattern and every medicine in one place. A few weeks of entries is usually enough to see it.
Headache diary: week of ______
| Date & time | Where it hurt | Strength 0-10 | Triggers | Medicines & dose | Cannabis: form, dose, time | What helped |
|---|---|---|---|---|---|---|
| Mon, 7:30 am | Back of head, neck | 6 | Short sleep, long screen day | Ibuprofen, 1 tablet | None | Water, dark room, eased by noon |
Prefer your phone? A headache app or a notes app works too, keep the same columns and bring the export or a screenshot to the appointment. A paper calendar with a mark on each headache day and each painkiller day is better than nothing.
Does cannabis help headaches? What studies show
The honest answer is that nobody knows yet for most headache types. Some people report that cannabis eases their headaches, and researchers are interested because the body’s own cannabinoid system takes part in pain control. But strong studies are few: individual studies point in different directions, much of the work is in mice, and no large trial in people has tested cannabis for headache. What exists is worth knowing, as long as it is read for what it is.
Choose a headache type to see what was tested
Each card gives the same three answers: what was tested, how strong it is, and the bottom line.
Migraine
Migraine has the most patient reports and its own research thread, covered on a separate page.
Mostly surveys and small studies; see the migraine page for the details.
Read migraine and medical cannabis rather than a summary here.
Cluster
Nothing as a treatment. A 2025 U.S. health-records study found cannabis-related disorders recorded in 3.9% of people with cluster headache, next to nicotine use disorder in 20.1% [1].
A large observational count of other diagnoses, not a test of cannabis.
That figure describes a coexisting problem, not a benefit. It is not a reason to try cannabis.
After a head injury
In mice with mild brain injury, drugs that slow the breakdown of the body’s own cannabinoid 2-AG, or that protect it in another way, reduced headache-like pain [2][3].
Animal studies only, in mice of one sex.
A lead for future research, in mice. Nothing yet in people.
Medication overuse
In female mice, repeated doses of formoterol, an asthma medicine, shifted cannabinoid levels in a pain-control area of the brain and produced headache-like pain [4].
One animal model of medication-overuse headache; not a cannabis treatment study.
It helps explain the mechanism. For rebound headaches, the proven step is still cutting back the overused painkiller with a doctor.
Tension-type
No study in this list tested cannabis for tension-type headache.
There is nothing to rate.
The most common headache is the least studied one. Home steps and posture come first.
How big is the effect?
Nobody can say yet. Measuring the size of an effect takes several trials that report the same outcome with a margin of error, and for cannabis in headache that set of trials does not exist. Anyone who quotes a percentage of “relief” is quoting a survey or a single small study, not a settled answer.
What this means for you: if headaches are frequent and the usual steps are not enough, cannabis is a reasonable question to raise with a physician, who will weigh it against your other medicines and the type of headache you have.
What the research shows, from strongest to weakest
Not all studies count the same. A randomized trial in people answers “does it work?” far better than a case report or a mouse experiment. Here is what exists for cannabinoids and headache at each level, with the background studies clearly marked.
| Level | What exists for headache | What it can and cannot tell you |
|---|---|---|
| Trials in people | Very few, and all small. No large trial has tested cannabis or a cannabinoid for any headache type. | The only design that can show cause and effect; for headache it has not yet given a clear answer. |
| Observational studies | A U.S. health-records study of cluster headache and its rarer relatives [1]; a nationwide survey in Nepal linking frequent headache with anxiety [5]. | Shows how common conditions are and what comes with them; neither tested cannabis as a treatment. |
| Case reports | Single patients: a brain bleed in a young adult who vaped and smoked cannabis [6]; a severe skin reaction linked to cannabinoids [7]. | Flags rare harms worth knowing about; says nothing about how often they happen. |
| Animal and lab work | Mouse studies of headache after mild brain injury and of medication-overuse headache, all working through the body’s own cannabinoid system [2][3][8][4]. | Explains why scientists are interested; results in mice do not transfer to people. |
Browse the studies yourself
Every study cited on this page, in plain words. Negative results and background studies are included.
Cluster headache and its rarer relatives in U.S. records
Counted 152,727 patients with cluster headache, a five-year prevalence of 56.7 per 100,000, and recorded cannabis-related disorders in 3.9% of them; diagnoses came from billing codes and were not checked by a neurologist [1].
Frequent headache and anxiety go together
People with headache on 15 or more days a month had about three times the odds of anxiety (odds ratio 3.2) compared with people without headache [5].
A brain bleed linked to vaping
A 32-year-old who had smoked cannabis daily for 20 years and also vaped developed bleeding in the brain; the authors cite 2.9 times higher odds of stroke with combined vaping and cannabis use [6].
A severe skin reaction linked to cannabinoids
Doctors describe Stevens-Johnson syndrome, a rare and serious reaction of the skin and mucous membranes, in a 32-year-old after cannabinoid use [7].
A blood clot after recreational nitrous oxide
A 23-year-old developed a leg clot and a lung clot after using nitrous oxide; cannabis use was listed as a possible coexisting factor [9].
Diabetes and weight-loss medicines in brain disorders
Reviews GLP-1 medicines across neurological and psychiatric conditions. None of its figures concern headache, so none are used on this page [10].
Cannabis and inflammation in post-COVID condition
Discusses how cannabinoids might act on brain inflammation in lasting COVID symptoms; a theory paper without patient data on headache [11].
The cannabinoid system in early COVID and long COVID
Maps what is known about cannabinoids in COVID infection and its aftermath; the authors call for controlled trials before any conclusion [12].
Protecting 2-AG after mild brain injury
Blocking the enzyme that breaks down the body’s own cannabinoid 2-AG reduced headache-like pain and nerve inflammation after repeated mild brain injury in mice [2].
A selective anti-inflammatory and post-traumatic headache
A drug that blocks COX-2 only for cannabinoid-like molecules, sparing its other jobs, eased headache-like pain after a mild brain injury in mice [3].
Where cannabinoid enzymes change after a head injury
After a mild brain injury, genes for enzymes that break down cannabinoids rose in nerve and brain areas that carry head pain, a possible reason the body’s own pain control weakens [8].
A model of medication-overuse headache
Repeated formoterol changed cannabinoid levels and receptors in the periaqueductal gray, a pain-control center, and produced headache-like sensitivity in mice [4].
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 kind of study, and the bar shows how many published studies on cannabinoids and headache are of that kind. Stronger designs are at the top. Gray bars are commentary, single cases and animal work, which cannot answer whether something helps patients.
Show as a table
| Design | Studies |
|---|---|
| Randomized trials | 1 |
| Crossover randomized trials | 1 |
| Cohort studies | 2 |
| Cross-sectional studies | 3 |
| Surveys | 3 |
| Narrative reviews | 12 |
| Case reports | 11 |
| Animal studies | 5 |
Can cannabis cause headaches? Next-day headache, withdrawal and overuse
Yes, it can, which surprises people who use it for the opposite reason. People who use THC do report headaches linked to it, and they tend to show up in three different situations that each call for a different response.
The next day
What it feels like: a dull, heavy head and dry mouth the morning after, sometimes called a cannabis hangover.
Why: poor sleep quality, dehydration, a strong dose, and often alcohol or late screens on the same evening.
What to do: water, food and rest; note the product and the dose in your diary, because the same thing tends to repeat.
When you stop after daily use (withdrawal)
What it feels like: headache together with irritability, poor sleep, vivid dreams and low appetite in the first days after stopping.
Why: the brain has adjusted to regular THC and needs time to readjust.
What to do: it usually eases day by day; if it is severe or you keep going back to cannabis to stop it, tell a doctor.
The third situation is overuse. People who reach for cannabis at the first sign of every headache can end up in the same loop as with painkillers: more frequent use, shorter relief, and a headache that seems to be waiting for the next dose. Frequent heavy use can also turn into cannabis use disorder. If you notice this pattern, it is worth a frank conversation with a physician rather than a bigger dose.
How the case happened
A 32-year-old with headaches, double vision and fevers was found to have bleeding inside the brain’s fluid spaces. The patient had smoked cannabis daily for 20 years and also vaped. The doctors noted that a butalbital-acetaminophen-caffeine headache pill, taken alongside, contributed to delusions and impulsive behavior during the illness [6]. One case cannot show cause and effect, but it shows why every form and every pill belongs on the list you bring to a doctor.
Ways to use cannabis for headaches: what each form avoids
Cannabis is not only smoked. People also vape it, swallow it as gummies, capsules or oils, hold drops under the tongue, or rub it on the skin. Each form avoids some risks and keeps others, and the products also differ in what they contain: THC, CBD or a mix, and an effect of THC does not carry over to a CBD-only product, or the other way around. This section explains the differences; it does not recommend a form.
How do you use it, or how would you?
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. The effect starts within minutes, which is why some people with headaches prefer it, but the dose is hard to measure, and smoke itself is a common headache trigger for others in the room.
Specific to vaping and dabbing
Dry-herb vaporizers, oil pens and cartridges avoid burning, but hot aerosol still travels the same airways. Concentrates used for dabbing, such as wax, shatter or rosin, are very strong. Vaping is the form named in the brain-bleed case report above [6].
Shared devices
A joint, pipe or vape passed between people also passes on colds, flu and other infections, and a cold is a headache of its own.
Specific to edibles and capsules
Gummies, chocolates, drinks, capsules and swallowed oils avoid smoke and vapor. They act slowly, often an hour or more, and last for hours, and the liver processes them before they reach the blood. A slow start is a poor match for a headache that is already pounding, and a second piece “because the first did nothing” is a common cause of taking too much.
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 the dose is still swallowed and goes through the liver, and the effect on the brain is the same as any other form.
Specific to topicals and patches
Creams and balms act mainly where they are applied, for example on tight neck and shoulder muscles; they are not a way to reach the brain. Transdermal patches are different: they deliver cannabinoids into the bloodstream, so their effects and interactions count the same as any other form.
Specific to prescription cannabinoids
Dronabinol (Marinol, Syndros), nabilone (Cesamet) and cannabidiol (Epidiolex) are FDA-approved medicines with an exact dose, prescribed by a doctor and filled at a pharmacy, not products bought with a medical card. None of them is approved for headache.
True of every form
- THC can cause drowsiness, dizziness and a faster heartbeat.
- It can add to the effect of sedatives, sleeping pills and opioid painkillers.
- Whatever reaches the blood is processed by the liver and can change levels of other medicines.
- 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, shared devices, hard-to-measure dose, all effects of THC |
| Vaping & dabbing | Burning plant material | Hot aerosol 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, liver processing, interactions |
| Tinctures & sprays | Smoke and vapor, shared devices | Effects on the brain, partly swallowed dose, interactions |
| Topicals | Most effects on the brain | Skin reactions; no effect on the headache itself beyond where it is applied |
| Transdermal patches | Smoke, vapor and swallowing | Effects on the brain, interactions, drowsiness |
| Prescription cannabinoids | Unknown product content | Drowsiness, dizziness, interactions; not approved for headache |
What science doesn’t know yet
The gaps here are large, and they matter more than any single result. Before anyone can say cannabis helps a particular headache, these questions need answers.
- Whether it works in people. No large randomized trial has tested cannabis or a cannabinoid for migraine, cluster, tension-type or post-traumatic headache, and no cannabinoid is approved for any of them.
- Whether mouse results hold for both sexes. Each of the brain-injury headache studies used mice of only one sex, so even the animal findings are incomplete [8][3][2].
- How the body’s own cannabinoids shape head pain. The roles of 2-AG, anandamide and the enzymes that break them down are described in mice, not in people [2][4].
- How reliable the large counts are. The biggest study of cluster headache relied on billing codes that no neurologist checked, and it could not see over-the-counter treatments or home oxygen [1].
- Which product, dose and form. Studies use different products, ratios of THC to CBD and ways of taking them, so there is no tested starting point to compare.
- Longer-term effects in frequent headache. Whether regular use changes how often headaches come back over months, for better or worse, has not been measured.
What would change the picture: randomized trials in people with a defined headache type, using a measured product and counting headache days per month against placebo.
Side effects and safety: blood pressure, dizziness and driving
Most side effects of cannabis come from THC and depend on the dose and the person. They are worth knowing before the first try, especially if headaches already come with dizziness or nausea.
Drowsiness
THC slows reaction time and can make you sleepy, more so with sedating medicines or alcohol.
Dizziness when standing up
Blood pressure can drop for a moment when you stand, which feels like light-headedness. Get up slowly.
Heart rate and blood pressure
THC can speed up the heart for a while after use. That matters with heart disease or high blood pressure.
Rebound and dependence
Frequent use can lead to withdrawal headaches and, in some people, cannabis use disorder.
Driving
Do not drive after using cannabis. Impaired driving laws apply to medical patients too.
Pregnancy and breastfeeding
Not advised in any form. Cannabinoid studies exclude people who are pregnant, planning to be or breastfeeding.
Headache, blood pressure and cannabis
Does a headache mean high blood pressure? Usually not: everyday high blood pressure rarely hurts. A headache becomes a blood pressure question when the reading is very high, the headache is severe and new, and it comes with chest pain, confusion, vision changes or shortness of breath, a hypertensive crisis, which belongs in the emergency room (see the warning signs). Stress and anxiety raise both blood pressure and headache frequency, which is one reason the two are so often linked in people’s minds.
What about cannabis, CBD and blood pressure? THC can raise heart rate and make blood pressure dip on standing, but the studies behind this page did not measure the effect of THC or CBD on blood pressure, so there is no figure here to quote, and none should be taken from a product label. If you have high blood pressure, narrowed arteries (atherosclerosis), a past stroke or heart disease, raise it before any form, and bring your home readings.
Medicines to discuss with your doctor
Open each one. This is what the studies recorded and what a physician will check, not a complete list and not a yes or no.
Butalbital-acetaminophen-caffeine combinations case report
These combination headache pills contain a barbiturate. In one reported patient who used cannabis daily and vaped, such a pill contributed to delusions and impulsive behavior during a brain bleed [6]. One case is not proof, but barbiturates and THC both act on the brain, so ask your physician to check this pairing.
Triptans (sumatriptan, rizatriptan and others) no study yet
No study cited here looked at triptans together with cannabis. Triptans narrow blood vessels and THC can speed up the heart, so the combination deserves a check if you have heart disease or high blood pressure.
Opioids, sedatives and sleeping pills no study yet
Opioid painkillers, benzodiazepines, muscle relaxants and sleeping pills can add their drowsiness to THC, which raises the risk of falls and slowed breathing. More on mixing cannabis and Xanax.
Blood pressure medicines no study yet
Some blood pressure medicines are also used to prevent migraine. Dizziness on standing from THC can add to theirs; ask your physician to check your dose and readings.
Blood thinners no study yet
THC and CBD are processed by the same liver enzymes as several blood thinners, so levels can shift. Aspirin and anti-inflammatory painkillers raise bleeding risk with blood thinners on their own. Your physician checks the exact medicine.
Anti-inflammatory painkillers and acetaminophen no study yet
Ibuprofen, naproxen, aspirin and acetaminophen are the medicines most people with headaches already take. Their main risk here is rebound from frequent use, and the liver with high acetaminophen doses. See mixing marijuana and ibuprofen.
What the doctor will ask: which forms of cannabis you use or would use, every medicine with its dose, how many days a month you take a painkiller, and what your diary shows. Prescriptions, over-the-counter pills and supplements all count, including the ones taken “only sometimes.”
Who should not use cannabis for headaches
For some people the answer is “not now” or “not at all,” however bad the headaches are. Studies routinely exclude these groups, so there is no evidence of safety for them.
- A history of psychosis – hallucinations or delusions; THC can bring them back. See cannabis and psychosis.
- Pregnancy or breastfeeding, or planning a pregnancy.
- Heart disease or a raised stroke risk, especially with vaping, which appears in a reported brain-bleed case [6].
- A new or changed headache not yet examined – see the warning signs first.
- Daily heavy use or cannabis use disorder, where withdrawal and rebound can be part of the headache.
- Under the age your state sets for patients.
Talk to a licensed physician about whether any of these apply
Is headache a qualifying condition for a medical card?
Usually not under that word. Few state programs list “headache” on its own. The common routes are a migraine diagnosis, chronic or severe pain, intractable pain, or a state rule that lets a physician certify another condition they judge serious enough. A physician has to match a diagnosis in your records to your state’s list, not a symptom.
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.
Migraine or headache is named in your state
The simplest case. Bring the diagnosis from a clinic note, and the physician evaluates you against that listed condition.
Chronic or severe pain is listed
Headaches that last for months and limit daily life may fit a pain category. Your diary and records are what show it.
Your physician may certify other conditions
Some states let the physician decide for a condition not on the list. Others do not, and then a card may not be available yet.
What else is in your records?
State lists go by diagnosis, not symptom: pick what a doctor has already written down.
Migraine: named in a number of state programs, and the most direct route for frequent headaches. Read migraine and medical cannabis.
Brain injury: a concussion or traumatic brain injury in your records may qualify where headache alone does not. Read brain injuries and medical cannabis.
Chronic pain: the most widely listed condition across state programs. Read chronic pain and medical cannabis.
Anxiety: often recorded alongside frequent headache: in a nationwide study, headache on 15 or more days a month came with about three times the odds of anxiety [5]. Read anxiety and medical cannabis.
Insomnia: poor sleep and headache feed each other, and a diagnosed sleep disorder is listed in some programs. Read insomnia and medical cannabis.
None of these: then the decision rests on your state’s wording and the physician’s judgment. Start with your state’s medical marijuana laws.
Diagnosis codes you may see in your records
Doctors record headaches with ICD-10-CM codes, the U.S. version of the international diagnosis list. The code on a clinic note or bill tells the evaluating physician which diagnosis was made and by whom.
| Code | What it means | Why it matters at the evaluation |
|---|---|---|
| R51.9 | Headache, unspecified | A symptom code; it shows headaches were reported but not which type. |
| G43.- | Migraine | A named diagnosis that some state lists include. |
| G44.0- | Cluster headache and other trigeminal autonomic cephalalgias | Shows a specific, often severe primary headache. |
| G44.2- | Tension-type headache | The most common type; chronic forms may count as long-lasting pain. |
| G44.3- | Post-traumatic headache | Links the headache to a head injury, which some programs list. |
Medical card or recreational purchase
In states with adult-use sales, adults can buy without a card. A card 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 |
| Home growing | Allowed for patients in some states, with plant limits | Allowed in some adult-use states, not in others |
| 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 headaches and medicines | None |
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 tax rates and how much you buy. Weigh that against the evaluation fee and any state registration fee. The breakdown is in medical vs. recreational cannabis taxes, and the wider differences in medical and recreational cannabis compared.
What the program in your state involves
Where cannabis stands legally differs widely: some states run a medical program only, some add adult-use sales, and some have no program at all. Where there is one, 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 records you in a confidential patient registry; in a few, the recommendation itself is what a dispensary asks for. Purchases happen at licensed dispensaries, and you can check a dispensary’s license with the state program.
Many state laws also let a patient name a registered caregiver who may buy and handle products on their behalf; who qualifies is set by each state. Cards from one state are not automatically valid in another; see which states accept out-of-state cards. Possession limits, home growing 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 your headaches: what type, how often, what you have tried, and the medicines already in use. It goes faster and safer when the facts are on the table, and it is fine to arrive with more questions than answers.
What to bring to the appointment
Tap each item as you get it ready.
Questions worth asking
- Could any of my headache medicines interact, and what would we watch for?
- THC, CBD or both, and why that choice for my type of headache?
- How will we know within a few weeks whether it is helping, using my diary?
- What should make me stop right away?
- How do I avoid trading painkiller rebound for cannabis rebound?
Which situation is yours?
A first card for frequent headaches
Answer the short check on this page first, then choose your state. See how your situation fits
Renewing a card
Renewal is a repeat evaluation on your state’s schedule, with your updated diary and medicines. How renewal works
Moving or traveling
A card does not automatically carry over to another state, and rules for visitors vary. Which states accept out-of-state cards
Worried about work, firearms or driving
Federal and state rules both apply, and your records are protected. Who finds out
An evaluation makes sense if
- Headaches keep coming back despite the usual steps.
- A doctor has already ruled out a dangerous cause.
- Your full medicine list can be reviewed.
- Your state’s program covers your diagnosis or a related one.
It is not the right step if
- The headache is new, sudden or changing and has not been checked.
- You are pregnant or breastfeeding.
- There is a history of psychosis.
- The hope is a cure rather than one more option.
This page summarizes published research for education. It does not replace a physician’s advice. Cannabis has not been shown to treat any headache type in people, and it can interact with common headache medicines. The evaluation fee for your state is shown before you pay, and your medical records stay protected under the HIPAA Privacy Rule [14].
How to get a medical card for headaches online
Everything happens online, so there is nowhere to travel and no waiting room to sit in with a headache. 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 your diary and any record of the headache 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 happens after you apply
After you submit the form and pay, a confirmation email tells you what comes next, and you agree on the appointment time with the physician. At the appointment the physician goes through your headaches, your diary and your medicines, and decides whether a recommendation is medically appropriate. If it is, the signed document is added to your account and documents, where you can download it.
The next step depends on your state. Where the state runs a registry, you submit the recommendation there and wait for the state to issue the card; only then can you buy at a licensed dispensary. In the few states where the recommendation itself is enough, a dispensary can serve you once you have it. Your state’s rules are on the laws and regulations pages.
Who you will see
A physician licensed in your state, one-on-one. The team that reviews this page and sees patients is introduced on our physicians page.
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
How the evaluation works, step by step, is on how the medical card works. Programs for veterans and for people with low income are available in some states.
Questions people ask about headaches and cannabis
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. What applies in each case is explained on how the medical card works and in the medical card FAQ.
Is headache a qualifying condition?
Rarely under that word. The usual routes are migraine, chronic or severe pain, or a physician’s judgment where the state allows it, see is headache a qualifying condition.
Does cannabis help headaches?
It has not been shown in people. Strong studies are few, and the most specific results come from mice, see what studies show.
Can cannabis cause headaches?
Yes: the next day, during withdrawal after daily use, and through overuse, see can cannabis cause headaches.
Can I take aspirin for a headache?
Most adults can, occasionally, at the label dose, but not children and teenagers, and not with a blood thinner or stomach ulcer without asking first. Details in over-the-counter medicines.
How long does a concussion headache last?
Usually days to a few weeks; some last for months. A headache that worsens after a head injury is an emergency, see when it happens.
Delta-8 or a hemp product instead of a medical 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, dizziness and interaction risks, and no physician reviews your headaches or medicines along the way.
Can I buy at any dispensary?
Only at dispensaries licensed in your state, and in some states only at medical dispensaries. Products there are tested and labeled with their THC and CBD content. Your state program lists licensed locations; rules by state are on the laws and regulations pages.
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 and documents. The steps are in what to do if your card is lost.
How do I renew my medical card?
Cards expire on a schedule your state sets, and renewal means a repeat evaluation with your updated diary, medicines and any new diagnosis. The renewal steps and price for your state are on its page: choose your state from the list at the top of this page.
Is an online evaluation legitimate?
Yes, where state law allows telemedicine, a medical appointment held online, for medical cannabis evaluations. The appointment is with a physician licensed in your state, one-on-one, and the recommendation is the same document an in-person visit would produce.
Who finds out? Privacy, firearms, work and driving
Privacy: your medical records are protected under the HIPAA Privacy Rule [14], 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 [15], 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 and drug tests. Read your state’s rules on the laws and regulations pages.
Driving: a card never makes it legal to drive impaired; do not drive after using cannabis.
More research on cannabis and headache
This page cites a selection of studies. Our research library holds every study we track on cannabis and headache, from laboratory work to clinical trials, and lets you filter them by cannabinoid, study type and year.
- studies
- 300+
- in people
- 120+
- clinical trials
- 16
References
15 sources
- 1. Prevalence, demographics, comorbidities, and treatment patterns of patients with the trigeminal autonomic cephalalgias: a retrospective analysis of United States electronic health records. DOI: 10.1186/s12883-025-04314-1 PMID: 40691779
- 2. Inhibition of 2-AG hydrolysis alleviates posttraumatic headache attributed to mild traumatic brain injury. DOI: 10.1186/s10194-024-01817-z PMID: 39014318
- 3. Substrate-selective COX-2 inhibition by IMMA attenuates posttraumatic headache via endocannabinoid modulation and neuroinflammatory suppression. DOI: 10.1186/s10194-025-02116-x PMID: 40797173
- 4. Formoterol dynamically alters endocannabinoid tone in the periaqueductal gray inducing headache. DOI: 10.1186/s10194-024-01907-y PMID: 39563240
- 5. Comorbidities of psychiatric and headache disorders in Nepal: implications from a nationwide population-based study. DOI: 10.1186/s10194-016-0635-8 PMID: 27102122
- 6. Intracranial Hemorrhage Secondary to Vaping: A Case Report and Literature Review. DOI: 10.7759/cureus.40288 PMID: 37448426
- 7. Weeding Out the Culprit: Cannabinoid-Associated Stevens-Johnson Syndrome. DOI: 10.7759/cureus.39454 PMID: 37362520
- 8. Distribution and subacute modulation of endocannabinoid metabolizing enzymes in the trigeminal complex and midbrain in a pre-clinical model of post-traumatic headache. DOI: 10.1186/s10194-026-02356-5 PMID: 41965551
- 9. Right iliac deep vein thrombosis and pulmonary embolism associated with recreational nitrous oxide: a case report. DOI: 10.1186/s12245-024-00689-z PMID: 39497058
- 10. Glucagon-like peptide-1 medicines in neurological and psychiatric disorders. DOI: 10.1016/j.xcrm.2025.102511 PMID: 41406951
- 11. Possible Role of Cannabis in the Management of Neuroinflammation in Patients with Post-COVID Condition. DOI: 10.3390/ijms25073805 PMID: 38612615
- 12. Cannabinoids and the Endocannabinoid System in Early SARS-CoV-2 Infection and Long COVID-19-A Scoping Review. DOI: 10.3390/jcm13010227 PMID: 38202234
- 13. Centers for Disease Control and Prevention, National Center for Health Statistics. ICD-10-CM: International Classification of Diseases, Tenth Revision, Clinical Modification. 2026.
- 14. U.S. Department of Health and Human Services. The HIPAA Privacy Rule. 2024.
- 15. Legal Information Institute, Cornell Law School. 18 U.S. Code § 922: Unlawful acts. 2024.