The time of appearance of breast tenderness is different due to individual differences. Some people will experience breast tenderness after ovulation when the corpus luteum forms, while others will experience breast tenderness only a week before menstruation, mainly due to the imbalance of hormone levels in the body. If the breast swelling and pain persist after menstruation, it is likely that there is breast enlargement or other problems with the breast. It is recommended to have an ultrasound examination of the breast or a mammogram after menstruation to find out whether there is organic lesion of the breast. In addition, it is also recommended to maintain a relaxed mood, regular life, do not smoke and drink excessively, may also reduce the situation of breast swelling and pain before menstruation, if necessary, you can take the oral treatment of Prozac.