Mammary hyperplasia is a kind of tumor-like lesion closely related to endocrine dysfunction, with breast tissue hyperplasia as the main cause, and has a close relationship with the occurrence of breast cancer. Breast hyperplasia can be divided into three categories: 1, breast adenopathy (predominantly glandular hyperplasia, interstitial fibrous hyperplasia is mild): breast adenopathy premenstrual breast swelling and pain, some patients for hidden pain or pins and needles, but the degree of mild, can be tolerated. There is no clear lumpy nodule, or the surface is uneven, only palpable sand-like tough nodules, or in mild cases, no obvious abnormality. Sonographic manifestations: bilateral breast enlargement, smooth border, complete, different degrees of thickening of the gland, echogenic enhancement, predominantly strong echoes in the form of strips and masses, the surrounding fibrous interstitial structure is thin. 2.Sclerosing adenopathy (interstitial fiber and glandular hyperplasia, often the former is more dominant): Signs: most of them are single, hard texture, border is still clear, palpable nodules, part of the nodules may appear tenderness. Sonogram: internal texture and structure disorder, uneven distribution of echoes, stripes of strong echoes and low echoes are basically the same. Fibrocystic hyperplasia (high dilatation of terminal lobular ducts and alveoli into cysts): cysts accompanied by epithelial hyperplasia, especially when there is epithelial heterogeneous hyperplasia, there is a possibility of evolving into breast cancer, and it should be regarded as a precancerous lesion. Symptoms and signs: most of the premenstrual breast swelling and pain, some patients have hidden pain or pins and needles pain, which is irregular, severe and unbearable. Sonogram performance: the breast can be seen in a number of different sizes of echogenic area, wall thicker, the rear echo enhancement, sometimes “beads”, some can be seen in the echogenic area of the nipple-like protrusion. Patients with breast hyperplasia who have ductal and follicular epithelial hyperplasia or atypical hyperplasia should be closely monitored. Although atypical hyperplasia is still a benign lesion, it has a tendency to become malignant, especially fibrocystic hyperplasia with atypical hyperplasia, which is considered to be a pre-malignant lesion of breast cancer. Signs of transformation of breast hyperplasia into breast cancer: patients with breast hyperplasia should pay great attention to regular follow-up and re-examination if they find that the original lesion has changed from clear boundary to unclear, infiltrated to the periphery, appeared neovascularization, and the index of resistance to blood flow has increased, and they should be operated at an early stage if necessary. Severe breast hyperplasia is closely related to breast cancer, and severe breast hyperplasia can be transformed into breast cancer. Therefore, patients with severe breast hyperplasia should undergo regular review for early detection and treatment.