There are several reasons for breast pain: first, the woman is a childbearing woman, after the first menstruation, the estrogen level in the body will change with each menstrual cycle, estrogen is elevated before and during the period, which will cause some stimulation to the breast, so the breast will be enlarged, hyperplasia, edema of the soft tissue of the breast, then there will be pain. The second aspect is mastitis. If a woman does not expel too much milk from her body in time during breastfeeding, there will be too much milk stagnation and therefore mastitis, or if the nipple cultivates a large number of bacteria on the basis of milk, the retrograde infection of bacteria will lead to inflammation of the breast. The third aspect is to consider other diseases of the breast, such as breast cysts or breast tumors, along with other symptoms, such as unevenness of the epidermis and discharge.