Leeches can be used as traditional Chinese medicine, the specific course of treatment with the patient’s own constitution and condition, there is no strict meaning of the “course of treatment”, the specific use of the physician should be under the guidance of the doctor’s orders. Leeches have the efficacy of breaking blood circulation and promoting menstruation, eliminating blood stasis and eliminating symptoms. Leeches, its flavor is salty, bitter, flat; a small poison; to the liver meridian, can be used for blood stasis and menstrual closure, mass in the abdomen (lumps), bruises and injuries and other conditions of treatment. It can be used for treating menstrual closure and obstruction in the abdomen, and often matched with products that break blood stasis and expel blood stasis; for treating bruises and injuries, it can be matched with medicines that activate blood circulation and heal injuries, such as sumac and natural copper. Leeches are poisonous and strong in breaking blood and removing blood stasis, therefore, pregnant women, women during menstruation and those who are weak and blood deficient, or those who have bleeding tendency should be prohibited from taking them, and the specific use of leeches should be carried out under the guidance of the physician and in accordance with the doctor’s instructions, and should not be used blindly for a long time.