The disease is common in middle-aged women between 25 and 40 years of age and is characterized by periodic pain in the breast, which can extend to the back of the shoulder, often with local tenderness and pain on vibration. Often manifests during pubertal development. ②Lobular hyperplasia: The most common clinical stage is seen in women aged 20-30 years old, with premenstrual breast swelling and discomfort, pain extending to the back of the shoulder and axilla, and localized nodules or lamellar tissue thickening of varying sizes, shrinking and softening after menstruation, but the nodules are difficult to completely subside, mostly distributed in the outer upper quadrant. (3) Neoplastic hyperplasia stage: further development from lobular hyperplasia, manifesting as uneven thickening of the entire breast, and small nodules or fibroadenomas with clear borders can be found in individual areas, with a certain degree of activity, which does not disappear after menstruation. Sclerosing mastopathy: It occurs mostly in women over 30 years old, the whole breast is a solid thickened flat lump or nodule without pressure pain, and there is no change of symptoms and signs before and after menstruation, if the nipples show plasma or plasma blood nipple overflow and axillary lymph node enlargement, there is a possibility of cancer.