Nipple pain in men may be caused by strenuous exercise, or it may be caused by diseases such as nipple inflammation, breast hyperplasia, and other diseases such as mastalgia. 1. Strenuous exercise: If a male patient experiences strenuous exercise, it may lead to clothing rubbing against the nipple, resulting in symptoms of nipple pain. 2. Nipple Inflammation: Nipple Inflammation is mainly caused by bacterial infection, and the patient will experience symptoms such as red, swollen, painful and cracked nipples. 3. Mammary hyperplasia: Mammary hyperplasia is mainly related to the patient’s endocrine, the patient’s main symptoms are breast pain, breast nodules or lumps, nipple discharge and other symptoms, which can also lead to nipple pain symptoms in male patients. 4. Other: mastalgia, breast cancer and other diseases can also lead to nipple pain in male patients. When male patients have symptoms of nipple pain, it is recommended that they should consult a doctor in time and follow the doctor’s instructions for treatment.