What Conditions Does Medical Cannabis Treat?

Medical cannabis has been studied and prescribed for a growing range of conditions, though the strength of clinical evidence varies significantly across different uses. Understanding which conditions have robust evidence versus those with preliminary or anecdotal support is important for patients considering medical cannabis.

The strongest clinical evidence supports cannabis use for chronic pain, chemotherapy-induced nausea and vomiting, and certain forms of epilepsy. The FDA has approved Epidiolex (cannabidiol/CBD) for treating severe childhood epilepsy syndromes including Dravet syndrome and Lennox-Gastaut syndrome. Dronabinol (synthetic THC) is FDA-approved for chemotherapy-induced nausea and AIDS-related weight loss. Numerous studies have demonstrated that cannabis can reduce chronic pain, particularly neuropathic pain, and may reduce the need for opioid medications.

Multiple sclerosis (MS) spasticity is another well-supported use. Nabiximols (Sativex), an oromucosal spray containing THC and CBD, is approved in many countries for MS-related spasticity, though it has not yet received FDA approval in the United States. Patients with MS frequently report that cannabis helps manage spasticity, pain, and sleep disturbances associated with the condition.

Moderate evidence supports the use of medical cannabis for post-traumatic stress disorder (PTSD), anxiety, sleep disorders, inflammatory bowel disease (Crohn's disease and ulcerative colitis), glaucoma, and appetite stimulation. State medical cannabis programs typically maintain lists of qualifying conditions, which vary widely. Some states include chronic pain as a catch-all qualifier, while others maintain strict lists limited to specific diagnoses.

Emerging research areas include the potential anti-inflammatory, neuroprotective, and anti-tumor properties of various cannabinoids, though most of this research remains preclinical. Studies are investigating cannabis for conditions including Parkinson's disease, Alzheimer's disease, fibromyalgia, autism spectrum disorder, and opioid use disorder. It is important to note that while preclinical results may be promising, rigorous human clinical trials are needed before definitive conclusions can be drawn. Patients should always consult with their healthcare provider before using cannabis for any medical condition, as cannabis can interact with other medications and may not be appropriate for everyone.