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" ... Technically, a medicinal leech is any leech that will feed on humans, and for centuries, physicians around the world have let these parasitic annelid worms suck their patients' blood as a form of treatment for headaches, fevers, and inflammation. The idea was that leeches removed "bad" or infected blood, or drained away excess blood to help restore the balance between the four substances called humors which were believed to control human health: blood, phlegm, black bile, and yellow bile. ... "