Some women have localized breast swelling and pain before menstruation, which is mainly due to the imbalance of hormone secretion in the body, for example, estrogen secretion is relatively high while progesterone secretion is relatively low, which will cause localized breast swelling and pain, which will be significantly relieved when menstruation occurs. If there is still localized breast swelling and pain during menstruation, it is necessary to exclude the possibility of localized organic lesions of the breast. It is best to go to the hospital for ultrasound or mammography three days after the menstrual period has completely cleared, mainly to find out whether there is breast hyperplasia or the possibility of localized breast tumors, and then give the necessary treatment according to the results of the examination. It is also recommended that women maintain a good mood in their daily life, which can to some extent avoid the possibility of breast swelling and pain before menstruation.