Localized ductal dilatation in the left breast means that the patient’s milk ducts are obviously not smooth, and there are many triggers, for example, caused by mastitis, or caused by the growth of masses in the milk ducts, which need to go to the general surgery department of the hospital, breast surgery department for clarification, and need to do the examination of lactoductoscopy, and the specific treatments are as follows: 1, anti-inflammatory treatment: if it is found to be caused by mastitis, there is no need to worry too much, and can be localized to carry on the cleansing, and actively discharge the milk, some patients need to give antibiotic treatment. Surgical treatment: If it is found to be caused by localized lumps, it is necessary to complete the relevant examinations, and under anesthesia, carry out localized mastectomy, and then send it to pathology biopsy, and if it is benign, it can be reviewed regularly. If the return is malignant, radical resection of the tumor should be carried out, with lymph node dissection, and chemotherapy, targeted therapy and traditional Chinese medicine should be given in the later stage, and alcohol should not be consumed during the treatment.