The concept of nipple overflow is called nipple overflow when blood, plasma, milk, or pus flows from the nipple during non-pregnancy, or when milk still flows for more than six months after stopping breastfeeding. There are many causes of nipple overflow, the common ones are intraductal papilloma, breast hyperplasia, breast duct dilatation and breast cancer. If the overflow is unilateral or single-hole bloody, further examination should be conducted; if it is accompanied by breast lumps, it should attract our attention. The above content is for reference only, please refer to the doctor’s interview for specific medication and treatment.