Bloodletting, often through the use of leeches, was a treatment devised centuries ago.What was this treatment used for?

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Bloodletting was often used to restore the balance of humors, as it was believed that an excess of blood in the body could cause illness. This treatment was based on the ancient Greek theory of humors, which held that the body contained four basic substances: blood, phlegm, yellow bile, and black bile. It was thought that a balance of these substances was necessary for good health, and that an excess of any one humor could lead to illness. Bloodletting was seen as a way to remove excess blood and restore balance to the body.

Bloodletting, Often Through the Use of Leeches, Was a Treatment