The breast swelling and pain that exists before menstruation is a normal physiological phenomenon at this time. Because before menstruation, the progesterone hormone or continuous increase will cause the blood vessels of the breast to expand, which will cause painful performance. At this time, you can relieve it by self-massage, including hot compresses. The pain will subside at the time of menstruation or after the end of menstruation and will not affect your health and is considered a normal PMS. However, if the pain persists until after the end of the period, it is not normal to consider whether there are breast lumps or breast enlargement, as breast diseases can also cause persistent pain. So you need to go to the hospital to register for a mammography examination to rule out any breast disease, so that you can handle and treat the situation accordingly and avoid prolonged pain that can affect your normal life and work.