The four humors, black bile, yellow bile, phlegm, and blood, were the focus of a medical theory called humor. Until the 19th century, humor dominated medical practice. Although debunked by modern medicine, traditional medicinal practices still suggest health problems are caused by imbalances in the body. The four humors are black bile, yellow bile, phlegm […]

The ancient Greek theory of the four humors, which believed overall health depended on the balance of blood, phlegm, black bile, and yellow bile, persisted until the 19th century. Although dismissed in medicine, the four personality types associated with the humors are still used in modern psychology. Medical treatments in the past attempted to rebalance […]