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theory has its roots in the ancient theory of humourism. It may have originated in Mesopotamia, but it was Greek physician Hippocrates (460-370 BC) (and later Galen) who developed it into a medical theory. He believed that certain human moods, emotions, and behaviours were caused by an excess or lack of body fluids (called "humours"), which he classified as blood, yellow bile, black bile, and phlegm, each

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