High hormone levels before menstruation stimulate ductal epithelial hyperplasia and interstitial congestion and edema in the breast, which results in breast swelling and pain and lumpiness to the touch. Just like the pelvic congestion and edema during menstruation, we will feel discomfort such as bloating and pain in the abdomen and falling during menstruation, the discomfort of bloating and pain in the abdomen and falling is considered by our ordinary female friends as a normal condition of menstruation, and few people go to the hospital because of this, then to premenstrual breast swelling and pain and this reason is the same, when you understand this reason you will not worry, most patients who go to the hospital are Physiological pain, not a major problem. The above mentioned is cyclical breast pain, but there are also some patients who have pain that loses its regularity and does not change with the menstrual cycle, which we call non-cyclical pain. The onset of non-cyclic pain is also related to endocrine disorders, not only caused by the normal female physiological hormone level, but also various other factors, such as anxiety, anger, fatigue, poor rest, etc. If we can pay attention to these aspects of life to properly adjust the mood, pay attention to rest, and appropriate stress reduction, most of them can be relieved on their own, which we still consider as a physiological phenomenon and will not be treated as pathological. However, some cysts, ductal dilatation, breast cancer and other diseases can cause pain themselves, and most of this pain does not change with the menstrual cycle, some have fixed pain areas, this pain is the pain related to the disease, how to identify it? So we say your symptoms are not physiological and you need to go to the hospital to let the doctor make a judgment.