It is normal for women to experience breast pain before menstruation, because the content of estrogen and progesterone in the body is relatively high in the pre-menstrual period, and estrogen promotes the proliferation of breast ducts, while progesterone promotes the proliferation of breast lobules, so there will be the symptom of breast swelling and pain, which is a normal phenomenon. If the symptom of breast pain does not occur in the premenstrual period, it is important to find out the cause, because it is an abnormal manifestation, and you need to go to the hospital for appropriate examination. In addition to the symptoms of chest pain before menstruation, during pregnancy, due to changes in hormone levels in the body, there will also be symptoms of breast enlargement and swelling, so in the event of chest pain, to rule out the possibility of pregnancy.