A form of medicine with its origins in ancient Greece. The name Unani derives from Ionia, reflecting its Greek origins. The principles of Unani medicine are those of the Hippocratic school of ancient Greece. They are based on four humours: blood, phlegm, black bile and yellow bile. Each humour was cold or hot, and wet or dry. For example, blood was hot and wet, phlegm wet and cold. The humours were produced during digestion. Ill health arose from disharmony of the humours. Medicines could re-establish the balance of the humours. For example, a hot medicine would treat a cold disease. As in Ayurvedic medicine, mind and body are seen as closely linked.