Breast pain on both sides accompanied by chest tightness may be caused by mammary gland hyperplasia, and can be diagnosed through breast ultrasound or mammography. Mammary gland hyperplasia is mainly related to hormonal disturbances in the body. External living environment, working and living conditions, interpersonal relationships, and other various stresses causing neuropsychiatric factors, can change the internal environment of the body, thereby affecting the function of the endocrine system. This may lead to abnormal secretion of one or several hormones. During the menstrual cycle, changes in the receptors in the mammary glands and internal hormone levels result in periodic changes. When the balance of hormones in the body is lost, with elevated estrogen and reduced progesterone secretion, it can lead to incomplete regression after the proliferation of mammary glands, causing breast tissue hyperplasia accompanied by pain.