Nipple blockage during breastfeeding may be caused by mastitis, breast cysts, breast cancer, etc. Patients can follow the doctor’s instructions through general treatment and follow the doctor’s instructions through oral medication, massage, surgery and radiotherapy. 1. Mastitis: A blocked nipple during breastfeeding may be a result of mastitis caused by milk stagnation. In this case, you should use hot towels and breast pump inhalation to deal with it, and you can also take oral antibiotics such as acetylspiramycin tablets and cefadroxil capsules as prescribed by the doctor to treat it. 2. Breast cysts: Breast cysts can compress the milk ducts during breastfeeding, resulting in a slower flow of milk, thus producing nipple plugging symptoms. Patients can evacuate the breast milk and have it massaged by a professional doctor, and cystectomy can be used to treat breast cysts. 3. Breast Cancer: Nipple plugging during breastfeeding may also be caused by breast cancer, which should be examined by the breast department of the hospital, and if diagnosed with breast cancer, breastfeeding should be stopped immediately, and surgery, radiotherapy and other methods of treatment should be chosen under the guidance of the doctor. If the nipple is blocked during breastfeeding, it is recommended that the patient go to the hospital in time to avoid delaying the condition and causing adverse consequences.