Locusts, also known as leeches, can be used to treat blood stagnation and menstrual cramps, bruises, swelling and pain. Leeches are the dried whole body of leeches, leeches or willow leeches of the leech family. It is salty, bitter and flat in nature; it is slightly poisonous. Attributed to the liver meridian. It can break the blood and pass the menstruation, expel blood stasis and eliminate the symptoms. It is used in treating blood stasis and menstrual occlusion, obstruction in the abdomen, lumps in the abdomen, hemiplegia, stroke and injury. Leech with sumac can activate blood circulation and dissipate blood stasis, and enhance the function of reducing swelling and relieving pain. It is suitable for bruises, fractures and tendon injuries, bruises and pain; leeches with rhubarb can activate blood circulation, eliminate blood stasis and relieve pain, and also can be used for laxative and laxative treatment of stagnation. It is suitable for those with blood stasis and internal obstruction, pain in the heart and abdomen, and inability to pass stool. Weakness of blood, pregnant women, women during menstruation and those with bleeding tendency are forbidden to take leeches. It is recommended to use the medicine under the guidance of a doctor.