Breast pain occurs half a month before menstruation, which is considered to be due to the relatively high level of estrogen in the body, resulting in the presence of breast hyperplasia. Breast tissue edema, can appear breast swelling, belongs to the physiological breast enlargement, usually in the menstrual period, breast swelling and pain will subside, in most cases do not need special treatment. During this period of time, the diet should be light, eat less meat, avoid health products and soy products, soy milk, soy milk and other foods too much intake. Because it is mainly related to the hormone level changes in the body, if the breast is still swollen and painful after the menstruation or after the clean up of the breast, it is considered that it may be a pathologic breast hyperplasia or other diseases of the mammary glands, you can consider in the clean up of the menstruation within 3-7 days, go to the hospital to do ultrasound mammography, a clear diagnosis, and then consider the targeted symptomatic treatment.