Breast pain during menstruation is caused by changes in estrogen and progesterone during menstruation, which is also one of the manifestations of menstrual syndrome. Estrogen and progesterone change differently during different menstrual periods. During the premenstrual period, estrogen is at a higher level, stimulating the development of breast follicles and the interstitial space of the mammary glands and causing breast tenderness, and after menstruation, estrogen decreases abruptly, and breast tenderness lasts for a couple of days, so there are still symptoms of breast tenderness during menstruation. If the symptoms disappear slowly after menstruation, it is normal physiological changes. If the symptoms persist or worsen, it is considered to be caused by breast hyperplasia, and it is recommended to go to the hospital to do breast ultrasound or molybdenum target examination. During menstruation, you should pay attention to a reasonable diet, do not eat spicy, stimulating food, so as not to affect the normal menstruation, aggravate the symptoms of breast swelling and pain.