There is no authoritative pharmacological study showing that leeches have the “miraculous effect” of lowering blood sugar, but clinically leeches can be used in the treatment of hyperlipidemia, cerebral infarction, cerebral hemorrhage, coronary heart disease, angina pectoris and other diseases, and can be used to alleviate the complications of diabetes mellitus, and it is recommended to use the medication under the guidance of a doctor. Leeches are flat in nature, salty and bitter in taste, with the effect of breaking blood stasis, removing blood stasis, promoting menstruation and eliminating symptoms, applicable to blood stasis and amenorrhea, obstruction in the abdomen (the appearance of tangible or intangible accumulation of lumps in the abdomen, with a feeling of distension and pain), and bruises and other injuries. Note that it is forbidden for those who are weak in blood, pregnant women, women during menstruation, and those with bleeding tendency. Patients with discomfort are advised to consult a doctor in time to identify the cause of the disease and standardize the treatment. If you want to use leeches to treat hyperglycemia or diabetes mellitus, it is recommended to ask your doctor first and never use leeches instead of regular hypoglycemic drugs without authorization.