Premenstrual breast swelling suddenly not bloated with the body’s hormone level secretion change related. After ovulation due to the ovarian corpus luteum secretion of estrogen and progesterone gradually increased, before the onset of menstruation estrogen levels reached a peak, stimulating the development of mammary tissue, breast follicular hyperplasia, vascular expansion and congestion, interstitial edema, etc., the symptom of premenstrual breast swelling. If pregnancy does not occur after ovulation, the estrogen secreted by the corpus luteum starts to decrease at this time, and drops to the lowest level before the onset of menstruation, so the symptom of premenstrual breast distension suddenly does not occur. If the breast swelling and pain before menstruation is obvious, affecting normal life and work, you can do local hot compresses to relieve the symptoms. Clinical breast swelling before menstruation if the symptoms are serious and can not be relieved, you need to go to the hospital in a timely manner in order to clarify the specific causes of the disease, and give targeted treatment.