Evidence

Research on the use of marijuana for specific conditions shows:

• Glaucoma. Marijuana might reduce the pressure in the eye caused by this eye condition. However, the effect appears to last only a few hours. Some findings indicate that marijuana may decrease blood flow to the optic nerve, increasing the risk for vision loss in people with glaucoma.
• Nausea and vomiting associated with cancer treatment. Research has shown that an active ingredient in marijuana, tetrahydrocannabinol (THC), effectively reduces nausea and vomiting in people undergoing chemotherapy.
• Pain. Marijuana use might reduce the intensity of shooting or burning pain often due to nerve damage (neuropathic pain) caused by HIV, diabetes and other conditions.
• Seizures. It's not clear if marijuana effectively treats seizures.
• Spasticity. Marijuana use might reduce muscle stiffness or spasms and urinary frequency caused by multiple sclerosis.