Nipple pain is not a sign of pregnancy, although during pregnancy, due to changes in the body’s hormone levels will lead to nipple swelling and pain, but the cause of nipple pain is also many causes, mainly including three aspects, as follows: First, when the nipple is subjected to external stimulation, such as cold or touching, can be caused by the physiological hardness, touch can be accompanied by pain and discomfort, but for the normal physiological phenomenon. Secondly, acute mastitis is an acute suppurative infection of the breast tissue. When the infection is large, a breast abscess can be formed and the nipple becomes engorged, enlarged and accompanied by severe pain. Third, cystic hyperplasia of the breast, its typical clinical manifestations of bilateral breast swelling and pain, accompanied by breast hyperplasia nodule-like changes, when the pain is severe can spread to the nipple, nipple pain phenomenon. In conclusion, nipple pain is not necessarily a sign of pregnancy, if you want to know whether you are pregnant or not, you should go to the obstetrics department of a regular hospital for HCG or gynecological ultrasound examination to make a clear diagnosis.