The main causes of pain between the two breasts are: a. pain before the onset of menstruation, is due to a substantial increase in estrogen in women’s bodies during menstruation, resulting in breast cell enlargement, edema, resulting in pain in the middle of both breasts or breasts, this situation generally does not require special treatment and treatment, it is recommended to pay attention to warmth and diet during menstruation. Second, disease factors cause pain between the breasts, common conditions such as mastopexy, mastitis, breast cancer, etc., will be accompanied by the development of the disease process caused by local discomfort symptoms in the breasts, manifested as double breast, unilateral breast or middle breast pain, as well as breast lumps, nipple overflow, etc. Third, pregnancy, postpartum breast pain, women in the early stages of pregnancy will secrete a lot of progesterone, prolactin, etc., prompting the breast reaction and breast enlargement, at this time will be accompanied by breast and the middle part of the breasts swelling pain. In addition, after childbirth, due to the milk evacuation is not timely, resulting in milk stagnation will also cause this symptom.