What’s wrong with the nipples becoming much bigger and hard? The nipples have become bigger and harder, generally in several cases: first, adolescent women with the ovaries began to secrete estrogen, progesterone, breasts and uterus began to gradually develop, the development of the breasts is manifested in the breast inside the lobules, ducts began to gradually develop, while the nipples and areola began to become larger, darker, and harder, with the development of maturity, about 17-18 years old breast development The nipples are more fully developed and harder, which is the first case. Second, the nipples become much larger and harder, that is, during pregnancy, after the fertilization of the woman’s ovum, the fertilized egg is planted in the endometrium to form a newborn, the breast in order to have milk secretion after the birth of the newborn to feed the newborn, the breast continues to develop, on the basis of the original development of the breast lobules, ducts continue to develop, more fully developed, mature, while the nipple, areola continue to become larger, and The nipples and areolas continue to grow larger and harder, and the color gradually becomes darker, which is the reason why the nipples become larger and harder.