Nipple pain in the chest at noon may be caused by nipple injury, nipple extrusion or nipple inflammation. 1. Nipple injury: For breastfeeding women, nipple pain can be felt when the baby accidentally scratches or bites the nipple with teeth when sucking during breastfeeding. It is recommended that patients wash them in time to avoid bacterial infection. 2. Nipple extrusion: If the patient’s nipple area is extruded for a long time, it will lead to insufficient blood supply to the nipple for a long time, and nipple pain will occur. If the underwear or intimate apparel worn by the patient is too tight, the patient can change to loose and comfortable clothes to relieve the symptoms. 3. Nipple inflammation: Inflammatory reaction due to bacterial infection caused by nipple breakage, nipple pain will occur. You can use antibiotic ointment to apply, such as erythromycin ointment, as prescribed by the doctor. In addition, breast hyperplasia, breast cancer, cardiothoracic diseases may lead to similar symptoms, it is recommended that patients go to the hospital in time for examination and diagnosis, under the guidance of the doctor for treatment.