the vital bodily fluids (phlegm, black bile, blood, yellow bile). • An imbalance of humors, he thought, accounted for abnormal behavior. • A lethargic or sluggish person was believed to have an excess of phlegm, from which we derive the word phlegmatic. • An overabundance of black bile was believed to cause depression, or melancholia. • An excess of blood created a sanguine disposition: cheerful, confident, and optimistic. An excess of yellow bile made people “bilious” and choleric—quick-tempered…
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