Why breast pain before menstruation

7 to 10 days before menstruation, breast or nipple pain, press as if there are hard lumps, even can not touch, but also show rib pain, abdominal pain, irritability upset, love angry, belongs to the scope of premenstrual syndrome, generally disappear after menstruation, no special treatment. Before menstruation estrogen, progesterone levels are too high, leading to mammary duct expansion congestion, breast interstitial edema, leading to breast pain, menstrual cramps, hormone levels decline, symptoms also disappear. Such as severe pain, the existence of a long time, may also be breast disease, the most common for breast hyperplasia, should go to the hospital to do related examinations.