There are physiological causes of breast pain before menstruation such as hormonal effects and pathological causes such as breast hyperplasia and premenstrual syndrome. 1. Physiological reasons: Before menstruation, hormones in women’s bodies will change, estrogen makes the development of glandular ducts, progesterone makes the development of glandular follicles, hormonal fluctuations before menstruation, there will be breast swelling and pain. 2. Pathological reasons: If women suffer from premenstrual syndrome, breast hyperplasia, breast nodules and other diseases, it will also cause symptoms of breast pain before menstruation, which belongs to pathology. It is recommended that patients should actively go to the hospital for formal treatment. There may be other reasons for breast pain before menstruation, so it is recommended that women go to the hospital for a detailed examination to clarify the cause.