This disease, also known as chronic cystic mastopathy (mastopathy), is a common occurrence in women and is commonly seen in middle-aged women. It is a benign hyperplasia of the breast parenchyma with a complex pathology. The hyperplasia may occur around the ducts and be accompanied by cysts of various sizes, or within the ducts with varying degrees of papillary hyperplasia and cystic dilation of the ducts, or in the lobular parenchyma. Etiology: This disease is due to the disorder of female hormone metabolism, especially the imbalance of estrogen and progesterone ratio, which causes excessive hyperplasia and incomplete replenishment of the breast parenchyma. The prominent clinical manifestations are breast swelling and lumps, characterized by the cyclical nature of some patients. The pain is related to the menstrual cycle, often increasing before menstruation and decreasing or disappearing after the onset of menstruation, sometimes throughout the menstrual cycle. Physical examination reveals diffuse thickening of one or both mammary glands, which may be confined to a part of the breast or scattered throughout the breast, with granular, nodular or lamellar masses of varying sizes, tough but not hard, and the thickened area is not clearly demarcated from the surrounding breast tissue. A small number of patients may have nipple discharge. The disease has a long course and develops slowly. The diagnosis of this disease is not difficult based on the above clinical manifestations. The possibility of malignant transformation is still debated, but the important thing is that breast cancer and this disease may co-exist. The treatment of this disease is mainly symptomatic, and can be treated with Chinese herbal medicine or traditional Chinese medicine, including draining the liver and Qi, harmonizing the flushing and regulating the ovarian function. Commonly used is the Chinese herbal medicine Prosperity San 3-9 g orally, 3 times daily. For limited cystic hyperplasia of the breast, it should be reviewed within 1 week to 10 days after menstruation. If the lumps become softer, shrink or subside, they can be observed and the herbal treatment can be continued. If the lump does not subside significantly, or if the local lesion is suspicious for malignant lesion during observation, it should be removed and undergo rapid pathological examination. If there is atypical epithelial hyperplasia, the scope of surgery can be decided in combination with other factors. If there are high-risk factors such as contralateral breast cancer or a family history of breast cancer, as well as those who are older and also have more obvious hyperplasia of breast tissue around the lump, simple mastectomy can be performed.