A little nipple pain can be caused by trauma, breast enlargement, mastitis and other reasons. 1. Trauma: Because the nerves in the nipple are more sensitive, the skin is more delicate, so if it is traumatized in life, it may cause nipple pain, if the symptoms are more serious, but also go to the hospital in time for treatment. 2. Mammal hyperplasia: a little nipple pain may be caused by mammary gland hyperplasia, mammary gland hyperplasia is generally due to progesterone, estrogen secretion abnormalities and other reasons, usually caused by glandular hyperplasia as well as metabolic changes, the symptoms of breast swelling and pain. 3. Mastitis: Mastitis may occur if the patient’s milk cannot be completely drained during breastfeeding, causing long-term obstruction of the milk ducts and reproduction of Staphylococcus aureus. The non-lactating patients may be due to bacterial infection, blocked milk ducts, long-term smoking, etc. Symptoms are often manifested as nipple pain, redness and swelling, breast swelling and pain. It is recommended that the patient go to a regular hospital in time to find out the cause of the disease and receive treatment as prescribed by the doctor, and the use of medication should be carried out under the guidance of the doctor.