Locusts are also called leeches. Leeches do not have anticancer effect, only the hirudin contained in leeches has the effect of inhibiting tumor cells. Leeches have the effect of expelling blood stasis and eliminating symptoms, breaking blood and promoting menstruation. It is mainly used for treating obstruction in the abdomen (tangible or intangible lumps appearing in the abdomen with distension and pain), bruises, blood stasis and menstrual occlusion, and pain in the heart and abdomen. Adverse reactions to leeches include skin rash, itching, nausea, vomiting, abdominal pain, diarrhea gastrointestinal bleeding and even coma. It is forbidden to be taken by those who are weak and blood deficient, pregnant women, women during menstruation and those who have bleeding tendency. Leeches are traditional Chinese medicine, if you need to use medication in the Chinese medicine practitioner under the identification can be used, not blindly use their own medication, so as not to cause adverse effects.