Symptoms of widening of breast ducts may be a physiological phenomenon or a symptom of certain diseases, such as breast hyperplasia, intraductal papilloma and breast cancer, etc., and the cause of the disease should be identified through timely consultation. 1. Physiological reasons: the secretion of milk during breastfeeding can lead to the dilatation and widening of breast ducts, which needs no special treatment. 2. Pathologic causes: (1) Mammary hyperplasia: caused by excessive proliferation or incomplete recovery of breast cells, generally many ducts can be seen to be expanded and widened during ultrasound examination, if not accompanied by other symptoms, it can be left unattended for the time being, and observation and follow-up should be the main concern. (2) Intraductal papilloma: The widening of the milk ducts is accompanied by the symptom of nipple overflow, and localized nodules or lumps can be detected. This disease often occurs in middle-aged and old women, and has a certain rate of malignant transformation. Surgery is the main treatment, and the next treatment plan is decided according to the postoperative pathology. (3) Breast cancer: It is an occupying tumor within the ducts of the breast, often manifested as a painless lump, which can be diagnosed by pathological examination, and needs to undergo comprehensive treatment mainly based on surgery in a timely manner. Breast duct widening should also be considered as a cause of breast duct dilatation, etc. After physiological causes are excluded, patients should consult a doctor for further examination under his guidance to clarify the cause of the disease and to treat the cause of the disease.