Breast pain is generally related to breast hyperplasia, and it can be diagnosed through the use of breast ultrasound or mammography. Currently, breast hyperplasia is believed to be associated with disruptions in the endocrine system leading to elevated levels of estrogen. Factors such as the external environment, work and living conditions, interpersonal relations, and various other stresses that cause neuropsychiatric impacts can alter the internal environment of the body. This, in turn, affects the function of the endocrine system, leading to abnormal secretion of one or more hormones. During the menstrual cycle, the receptors in the breast tissue undergo cyclical changes due to the fluctuation of hormone levels. An imbalance where estrogen levels are high and progesterone secretion is reduced can result in incomplete regression of breast hyperplasia after the growth phase, causing breast tissue hyperplasia. Additionally, differences in the quality and quantity of estrogen receptors in the breast tissue may contribute to uneven growth levels across different parts of the breast.