Overview. There are many domestic and foreign names for mammary hyperplasia, with more than 40 names in succession, such as cystic hyperplasia of the breast, chronic fibrocystic mastopathy (mastopathy), lobular hyperplasia of the breast, WHO now recommends mammary dysplasia, and in 1972 the National Office of Cancer Control named it mammary hyperplasia. Definition. It is the most common breast disease in middle-aged women, but is rare in adolescence and post-menopause. It is mainly related to ovarian dysfunction, but in recent years, with the improvement of people’s material and cultural living standards, the number of patients with the disease has increased year by year, and the age of onset has a tendency to develop younger. Some people call it the “modern disease” of women. Etiology. The disease is an endocrine disorder hyperplasia, one is the disorder of female hormone metabolism in the body, especially the ratio of estrogen and progesterone imbalance, so that the parenchyma of the breast overgrowth and incomplete replenishment. Second, the quality and quantity of female hormone receptors in some of the breast parenchyma components are abnormal, resulting in uneven degree of hyperplasia in various parts of the breast. Diagnosis 1. Symptoms and signs Periodic changes of pain, tenderness and nodular masses. 2.Physical examination Ultrasound examination is simple, can be performed and reviewed several times, and can accurately determine the size of the mass. Based on the cystic and solid nature of the mass and the relationship between the mass and the surrounding breast tissue, preliminary identification of breast cyst, adenofibroma and cancer can be made. At present, the correct diagnosis rate of masses >2 cm in diameter is generally reported to be over 90%.