Breast pain may be a clinical manifestation of the onset of menstruation. Breast swelling and pain before menstruation is a special clinical manifestation before menstruation, but other causes can also cause such symptoms, such as breast hyperplasia, pregnancy and other conditions. When women experience breast pain, it may be a sign that menstruation is about to begin. If it is close to the menstrual cycle, with the change of hormone levels in the body, it can lead to physiological breast swelling and pain. If there is no menstruation for more than one menstrual cycle, and recently had unprotected sex, chest pain, can not be ruled out the possibility of pregnancy, some women can have chest pain in the early stages of pregnancy, can be early pregnancy test paper test, blood HCG test, and so on. If the patient continues to have chest pain, accompanied by breast lumps or nodules, it may be caused by breast hyperplasia, most of them are physiological hyperplasia, and a small number of patients with serious breast hyperplasia can be treated accordingly. For patients with chest pain, it is recommended to pay attention to rest, avoid overwork, prevent cold and keep warm, avoid emotional fluctuations, so as not to affect the menstrual flow. Patients with breast enlargement should pay attention to the regularity of life, strengthen the exercise, avoid high estrogen diet, pay attention to self-examination and regular review.