Medical cannabis refers to the parts of the herb cannabis used as a physician-recommended form of medicine or herbal therapy, or to synthetic forms of specific cannabinoids such as THC as a physician-recommended form of medicine. The Cannabis plant has a long history of use as medicine, with historical evidence dating back to 2,737 BCE. Cannabis is one of the 50 "fundamental" herbs of traditional Chinese medicine, and is prescribed to for a broad range of indications.