In the Middle Ages, there was a thing called "Bloodletting". Doctors would remove large quantities of blood from patients, the main ways of doing this was leeching or venesection. Leeching was placing a leech on a body part to let it suck the blood out of the person, and venesection was using a knife called a "fleam" to cut skin and let blood literally drip from the person. They believed that this would keep them healthy and people often did this on a regular basis.
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