The causes of breast pain are mainly divided into the following cases according to the different diseases that cause pain: first, pain caused by pathological hyperplasia and physiological hyperplasia of the breast, women before the onset of menstruation, the level of estrogen in the body will rise, estrogen can stimulate the breast ducts and other tissues of the breast, causing physiological hyperplasia of the breast, with pain in the nipple or breast, after the end of menstruation, the estrogen level drops, and the breast recovers If the estrogen level does not return to normal after menstruation, the breast will continue to grow and there may be pain when pressing on the breast, which is pathological pain. Secondly, benign breast lesions such as breast nodules or breast cysts may cause breast pain due to the enlargement of the swelling compressing the surrounding nerves, or they may compress the nerves around the breast tissue and cause pain when pressed, which is pathological pain. Third, breast milk stagnation during lactation, early pregnancy estrogen stimulation and breast development during growth and development, these special periods cause pain when pressing on the breast. Fourth, malignant tumors of the breast, advanced tumor invasion of more breast tissue or compression of the nerve, resulting in pain on pressure. Fifth, trauma to the breast, causing damage to the breast tissue, resulting in pain when pressing. Sixth, men generally for mammary gland hyperplasia or normal growth and development leads to pain when pressing the chest.