Here are some of the debilitating conditions that have been treated successfully with medical marijuana:
Nausea and vomiting — Cannabis has been shown to drastically reduce symptoms and increase appetite.
Anorexia and cachexia — The appetite-enhancing properties of cannabis help patients maintain a stable body weight.
Movement disorders — Positive results have been documented in Tourette’s syndrome, dystonia, multiple sclerosis, and tardive dyskinesia.
Pain — Large-scale clinical studies have proven that cannabis has analgesic properties. It has been successfully used to lessen pain associated with cancer, HIV/AIDS, headaches, menstrual cramps, chronic bowel inflammation, and multiple sclerosis.
Glaucoma — Cannabis has been shown to reduce intraocular pressure by an average of 25% – 30%.
Epilepsy — Studies have shown that cannabis provides an antiepileptic effect on some animals. Although studies on humans haven’t been conducted, many patients use medical marijuana to control epileptic seizures.
Psychiatric symptoms — Clinical studies have shown cannabis to help improve mood in many reactive depression patients. Medical marijuana has also been used to treat anxiety, sleep, and bipolar disorders.
Autoimmune diseases and inflammation — Cannabis has been used as an analgesic and anti-inflammatory for symptoms stemming from ulcerative colitis, arthritis, and allergies.
Other symptoms — Marijuana has also been used to treat a range of symptoms that aren’t easily categorized, including chronic hiccups, pruritus, high blood pressure, tinnitus, attention deficit syndrome, and chronic fatigue syndrome.
Source for clinical studies: http://www.cannabis-med.org/english/studies.htm