Breast swelling and pain before menstruation are symptoms of premenstrual syndrome. This swelling and pain generally disappear after the onset of menstruation and are greatly related to emotional states. Therefore, it is important to maintain a relaxed mood, exercise regularly, ensure sufficient sleep, and avoid overwork and staying up late to reduce or eliminate these symptoms. Some people may become irritable, which can exacerbate the pain and swelling. Thus, breast swelling and pain are not normal, but they are also related to hormone secretion.