Why are leeches used in medicine?

If a person is treated with leeches, it is called hirudotherapy. The leech has several pronounced health effects. They are planted at certain biologically active points. A leech bite in this place causes a reflex effect. During the bite, the leech releases active substances into the blood, including hirudin. These substances improve blood supply, make the blood more fluid, and improve its delivery to all organs. Therefore, leeches are used for diseases with poor oxygen supply. Leeches are contraindicated in diseases with increased bleeding.