Breast pain after menstruation may be physiological, but does not exclude pathological factors, such as breast disease. 1. Physiological factors: it may be due to the fact that after menstruation, the hormone levels in the body change, which causes breast pain. Especially when estrogen and progesterone fluctuate greatly, it may cause breast pain and discomfort. This situation does not need to worry too much, usually in the physiological period after the pain will gradually disappear. 2. Pathological factors: such as breast hyperplasia and other mammary gland diseases, can cause hormone imbalance, estrogen level increases, which leads to breast pain after menstruation. Some patients also have nipple discharge, irregular menstruation, etc. It is recommended to go to regular hospitals for diagnosis and treatment. In addition, breast pain after menstruation should be promptly consulted for further examination to determine whether there is any abnormality, and symptomatic treatment according to the specific causes.