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Of the 650 species of leech listed, Hirudo medicinalis is one of the most extensively studied. This annelid from the subclass Hirudinea has 2 suckers, one housing the mouth and its 3 jaws. It lives mainly in the stagnant waters of marshes and ponds. When it comes to reproduction, the animal is a hermaphrodite. Inseminated leeches lay their eggs during the spring and summer months, outside the water, with cocoons containing as many as thirty young.
Credit: Getty Images Getty Images News Getty Images. According to Mehdi Leech Therapist, leech therapy can be used for a variety of diseases and conditions. As a result, leeches are used to treat arthritis, arterial or venous disease, heart conditions and bronchitis. Out of the 600 species of leeches that are known, 15 are used medically. People suffering from such GI conditions as hepatitis or stomach ulcers can benefit from leech therapy. Patients suffering from gynecological disorders receive relief by the use of leeches as well.