Nipple discharge is one of the three major symptoms of breast disease after breast lumps and breast pain, with an incidence of 3% to 8%. There are 7 types of overflow: milk-like, watery, pus-like, mucous jelly, plasma, plasma blood and blood. The nipple overflow is divided into 3 types: functional, pharmacologic and pathologic. Functional overflow is a normal physiological phenomenon that occurs during pregnancy and lactation, occasional small amounts of intermittent overflow after several years or even more than 10 years of weaning, and unilateral or bilateral small amounts of overflow in women before and after menopause. The overflow caused by taking estrogen, birth control pills, and sedatives such as methyldopa, reserpine, morpholine, and chlorpromazine is a drug-related overflow, which can heal on its own after stopping the medication. Nipple overflow caused by diseases of the breast itself and endocrine and other systemic diseases is pathological overflow. If you are under 50 years of age, if you have a porous or bilateral clear water-like or milk-like nipple overflow for a short period of time and are not accompanied by a breast lump, it means that the lesion is widespread, benign lesions are common, and there is no indication for surgery, so it can be treated with medication; intraductal papilloma can be treated with laser therapy under fiberoptic ductoscopy; surgical treatment includes (1) if you are over 50 years of age, if you have a single porous nipple overflow, especially if you have a bloody overflow and can find a lump, you have a high incidence of breast cancer The incidence of breast cancer is high, so surgical biopsy is necessary, and radical surgery should be performed if it is malignant. Long-term single-pore overflow without a lump is associated with a high incidence of breast cancer and is indicated for surgery.