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Bloodletting was an important part of any medieval doctor’s belief system.

A patient had two options: leeches or venesection.

With the leeches, a “blood worm” would be administered on the pertinent body part and the creature would—in theory—suck the illness out.

It sounds a little nicer than the latter option: the doctor would just slice open a vein with his “fleam” and hope for the best.

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