The belief that if an individual had a lot of blood,they would have a cheerful or sanguine personality stems from:

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The belief that a lot of blood leads to a cheerful personality comes from the humoral theory developed by Hippocrates. This theory suggests that there are four bodily fluids or humors (blood, phlegm, yellow bile, and black bile) that correspond with the elements of the universe (air, water, fire, and earth) and influence a person's health and personality traits. According to this theory, having an excess of blood was associated with a sanguine temperament.

The Belief That If an Individual Had a Lot of Blood,they