Aunt refers to menstruation, before menstruation chest swelling suddenly not bloating is a normal body reaction, may also be after pregnancy symptoms. 1. Normal body reaction: some women in the menstrual period before the onset of symptoms may appear chest bloating, will soon come to menstruation two days before the hormonal changes in the body, may lead to chest bloating suddenly do not bloat, generally do not have to treat, usually need to pay more attention to rest. 2. Pregnancy: If you are pregnant, the estrogen and progesterone in your body will change after pregnancy, which may cause your chest to suddenly stop swelling. Need to consult a doctor in time to determine whether there is pregnancy. Part of the patient before the onset of menstruation chest swelling is a normal reaction, so there is no need to have too much psychological pressure. If the symptoms of breast swelling occur frequently, you need to be alert to the possibility of breast diseases, such as mastitis, breast hyperplasia and other diseases may lead to such symptoms.