The medicinal properties of the cannabis plant have been known for millennia. As far back as 2800 BC, cannabis was used to treat a vast array of health problems and was listed in Emperor Shen Nung's pharmacopoeia. Cannabis has a long and colorful history. The use of cannabis originated in central Asia or western China. Cannabis has been used for its alleged healing properties for millennia. The first documented case of its use dates back to 2800 BC, when it was listed in the Emperor Shen Nung's (regarded as the father of Chinese medicine) pharmacopoeia. Therapeutic indications of cannabis are mentioned in the texts of the Indian Hindus, Assyrians, Greeks and Romans. These texts reported cannabis to treat a vast array of different health problems, including arthritis, depression, amenorrhea, inflammation, pain, lack of appetite and asthma.