Breast cystic hyperplasia is a frequent disease in women, commonly found in middle-aged women, is characterized by the formation of cysts with high expansion of the lobular ducts and terminal ducts of the mammary glands, accompanied by adverse lesions of the mammary gland structure of the disease is also known as chronic cystic mastopathy, cystic desmoplastic mammary hyperplasia fibrocystic mastopathy, and so on. Compared with simple breast hyperplasia, the coexistence of breast hyperplasia and atypical hyperplasia in this disease and the risk of malignant changes is the difference. It should be regarded as precancerous lesion. Etiology: This disease is caused by the disorder of female hormone metabolism in the body, especially the imbalance of the ratio of estrogen and progesterone, which leads to excessive proliferation and incomplete regeneration of the breast parenchyma, resulting in different degrees of hyperplasia in various parts of the breast. Clinical manifestations: prominent manifestations are breast swelling and pain and lumps, characterized by some patients with cyclicity, pain related to menstrual cycle. Treatment: mainly symptomatic treatment, available in Chinese medicine or proprietary Chinese medicine ordinance, including dredging the liver and regulating qi, harmonizing congestion and regulating ovarian function. If the lumps do not subside significantly after menstruation and after taking medication or if there is a possibility of malignant transformation, they should be surgically removed. It has been reported in foreign literature that the application of anti-estrogen treatment for breast atypical hyperplasia can significantly reduce the incidence of breast cancer.