Generally, before the onset of menstruation, it is normal to experience premenstrual breast swelling and pain due to the increase in estrogen levels. After menstruation, the estrogen level decreases and the symptoms of breast swelling will gradually subside. If the symptoms of breast swelling are serious, you can perform breast massage to relieve the symptoms. However, if there is a breast lump at the same time, it is recommended to go to the hospital for ultrasound or mammogram and other related examinations to treat the symptoms according to the examination results. If your chest swelling is relieved but your period has not yet come, you should first undergo a relevant examination to rule out the possibility of pregnancy.