There are different reasons for blocked milk ducts and different ways to unclog them. Generally, the causes of clogged ducts are due to lifestyle habits, milk stagnation, breast cancer and so on. 1. Lifestyle habits: It may be due to inappropriate underwear or not paying attention to the hygiene around the breasts, which leads to the blockage of mammary ducts. It is recommended to change comfortable underwear and keep the skin of the mammary glands clean, and to develop good lifestyle habits. 2. Milk stagnation: blocked milk ducts are caused by milk stagnation in breastfeeding women. It is recommended to massage the breasts with appropriate techniques to promote the unclogging of the milk ducts, and to promote the discharge of bile through breast pumps. Therefore, breastfeeding women should pay attention to keep the nipple area clean, it is recommended to use water for localized appropriate wiping. 3. Breast cancer: Breast cancer usually leads to symptoms such as breast lumps, blocked milk ducts and nipple overflow, etc. It is recommended to consult a doctor in time and use drugs such as doxorubicin, docetaxel and cyclophosphamide under the doctor’s guidance for treatment, as well as surgical treatments, such as breast-preserving surgery and total mastectomy, are needed. Breast duct blockage should also consider benign breast tumors, such as intraductal papilloma and other causes. If the patient has breast duct blockage, it is recommended to go to the hospital in time for examination, to clarify the cause of the disease, and to carry out treatment.