There are many reasons for nipple pain after coitus, such as physiological factors, external factors, breast diseases and so on. 1. Physiological factors: if the woman in the same room in the ovulation period, may be due to changes in the body’s hormone levels, which leads to nipple pain phenomenon, usually has nothing to do with the same room, generally belong to the normal physiological phenomenon. 2. External factors: nipple pain after intercourse may be due to the process of intercourse, nipple suffered external stimulation. 3. Breast disease: breast hyperplasia, mastitis and other diseases, can also cause nipple pain phenomenon, usually has nothing to do with coitus, will not regularly appear pain. There are many reasons for nipple pain after intercourse, and it is recommended to go to the hospital in time to improve the examination and take standardized treatment according to the doctor’s instructions, so as not to ignore the symptoms and take them lightly.