The symptoms of nipple swelling may occur in early pregnancy, which belongs to the early pregnancy reaction manifestation. After pregnancy, due to increased levels of estrogen and progesterone in the body, it will stimulate the growth and development of breast ducts, breast space congestion and edema, which will lead to breast enlargement, nipple swelling, nipple enlargement and other symptoms, and with the increase of the pregnancy week, it will also appear nipple, areola deepening in color, and there is a phenomenon of Montgomery’s nodules. This is a normal physiological phenomenon, generally in the third month of pregnancy after the symptoms of breast swelling and nipple swelling will gradually reduce. If the nipple swelling and pain symptoms are more serious in early pregnancy, it may also be caused by breast hyperplasia, such as women themselves suffer from breast disease, after pregnancy, hormone levels increase, will aggravate the discomfort of breast hyperplasia symptoms, breast and nipple swelling and pain will be obvious. You can apply hot compresses to relieve the pain and avoid using medication at will. Early pregnancy breasts and nipples will become sensitive, pregnant women should pay attention to wear loose underwear, reduce the breast and nipple squeeze, stimulation, and need to pay attention to breast hygiene.