What was the name of the Hippocratic medical theory that prevailed in western medicine until the 18th Century?

Answer: The Theory of the Four Humours. It was believed that the body was made up of four main fluids (humours): Blood, Phlegm, Yellow Bile and Black Bile and that all illnesses were a result of an imbalance of the humours; which led to common treatments such as blood-letting.

Source: The Rise of Experimental Biology: An Illustrated History by Peter L. Lutz

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