Nipple swelling, pain is often due to the following reasons: 1, mastitis: if the patient is located in the breastfeeding period, the nipple appeared obvious swelling, pain is often the problem, you can go to the hospital breast surgery or general surgery to make clear, need to carry out lactation treatment, part of the patient also need to cooperate with physical therapy and antibiotic treatment, in the period of treatment can be appropriate to increase the water intake, appropriate intake of fresh fruits and vegetables. 2, the growth of swelling in the breast tube: such as breast tube tumor, etc., need to go to the hospital to check the breast ultrasound or molybdenum target, etc. to clarify, if the disease, need to perform surgical treatment. 3, the growth of swelling in the breast: such as breast fibroids, or even malignant tumors of the breast, so need to improve the relevant examination, found that the swelling needs to be done after the swelling puncture biopsy, or excisional biopsy to clarify the nature of the swelling.