5 Most Common Reasons Doctors Recommend Medical Cannabis

Since California legalized cannabis back in ’96, there’s been a lot of questioning and controversy over what should or shouldn’t be considered a qualifying condition to use the plant medicinally. Unfortunately, the patchwork of laws means that you may qualify in one state but not the next – but there are a handful of common reasons doctors recommend medical cannabis that you’ll find in (just about) any place where medical marijuana is legal.

Recommendation VS Prescription: Can Doctors Prescribe Medical Marijuana?

In the United States, state-program recommendations or certifications and prescriptions for approved medicines follow different rules. The 2026 federal actions changed the scheduling of qualifying medical marijuana products, but do not establish that every cannabis product is an approved prescription treatment.

The following categories describe reasons people seek medical cannabis. They are not a universal ranking of effective treatments or a list of conditions that qualify everywhere. The 2019 registry analysis and survey of self-reported medical use describe different populations. Their percentages should not be averaged or treated as current national prevalence.

1. Relief for Chronic Pain

Overwhelmingly, the most common reason for medical cannabis use, both self-reported and based on data from medical cannabis programs around the U.S., is chronic pain. This is also the condition for which there is possibly the most evidence validating the use of cannabis as an alternative to pharmaceutical options.

According to the PubMed Central study, it found that 53% were primarily using cannabis for chronic pain, so it shouldn’t be surprising that the Health Affairs study found over 60% of both doctor-certified and self-reported qualifying conditions were listed as chronic pain.

These figures describe use in the studies, not the probability that treatment will work. Evidence suggests modest short-term benefits for some chronic pain conditions, with adverse effects and substantial variation between products. See our chronic pain evidence guide.

2. Anxiety Disorders

Possibly, the next most common reason people seek a medical cannabis recommendation is for anxiety in one form or another. However, most people who use medical cannabis for anxiety have a comorbid qualifying condition that may be their primary reason for obtaining a doctor’s recommendation.

While the Health Affairs study doesn’t look at anxiety as a single category, it found PTSD specifically counted for roughly 4% of medical cannabis patients – which does not establish the combined prevalence of other anxiety disorders.

According to the PubMed Central study, over 50% of self-reported cannabis users claim anxiety to be the main use for medical cannabis. Keep in mind that the study looked at physical and mental health separately and was looking at self-reported medical cannabis use.

3. Sleep Disorders like Insomnia

Another condition that isn’t always the initial qualifier for medical cannabis that many use medical cannabis for is treating insomnia. Reported use for sleep does not prove an insomnia treatment benefit. Individual responses, next-day impairment, tolerance, and sleep disruption after stopping need consideration.

While insomnia can occur on its own, it is usually a symptom of the underlying qualifying condition, such as chronic pain or anxiety over a debilitating illness like cancer, HIV/AIDs, or MS, that leads to problems sleeping in the first place.

4. To Fight Nausea and Vomiting

Of the physical conditions that lead to a medical cannabis recommendation, nausea and vomiting are also among the most common. Evidence and approved uses are specific: certain prescription cannabinoid medicines are used for chemotherapy-related nausea and vomiting. Cannabis is not a general-purpose anti-nausea treatment, and frequent use can itself cause recurrent vomiting in cannabinoid hyperemesis syndrome.

Again, this is usually a symptom of an underlying condition like HIV/AIDs or cancer and not a symptom that (often) on its own would be a qualifier for medical cannabis. The Health Affairs study says that around 6% of medical cannabis users are simply trying to keep chemotherapy-induced nausea and vomiting at bay.

5. Stimulating Appetites

Once the fight to end the nausea is over, cannabis is sometimes used to stimulate appetite. Benefits depend on the underlying illness and product; a report of increased appetite is not proof of improved weight, function, or survival.

According to the PubMed Central study, 22% reported using cannabis to stimulate appetite, closely followed by 21% reporting they use it to calm their stomach (fight nausea). According to the Health Affairs study, 3% report using cannabis to treat cancer-associated appetite problems.

Other Conditions that Doctors Routinely Recommend Treating with Medical Cannabis

Eligibility varies by state, and a qualifying condition is not a clinical endorsement. Glaucoma is an important example: ophthalmology guidance does not recommend cannabis for disease control. Prescription cannabidiol has specific epilepsy indications and is not interchangeable with retail CBD. Discuss the evidence, established treatments, interactions, and monitoring with the treating clinician before pursuing a recommendation.