There are many reasons for breast enlargement, see the following analysis: 1, puberty development, this period of female breast tissue growth breasts will grow, the phenomenon of swelling is a normal physiological phenomenon do not have to worry about. 2, endocrine disorders, before menstruation and menstruation in the body of estrogen increases lead to breast swelling, enlargement, after the end of menstruation, the symptoms will disappear. If the pain is obvious, you can eat lactobacillus, long time you can take traditional Chinese medicine. 3, breast hyperplasia, breast hyperplasia patients will have nodules in the breasts, nodules will make the breasts to produce swelling and pain and sense of enlargement, after menstruation, the symptoms will disappear, the nodules are obvious impact on the life of the beauty of the operation can be removed. 4, breast fibroids, fibroids are more obvious breast deformation and swelling, if it is too serious need for surgery to remove the tumor. If it is too serious, surgery is needed to remove the tumor.