Breast hyperplasia is neither tumor nor inflammation. Histologically, it is hyperplasia and degeneration of breast tissue, which is closely related to endocrine dysfunction. This disease mostly occurs in middle-aged women, adolescents and postmenopausal women. Nowadays, 50%-70% of professional women in big cities have breast hyperplasia to varying degrees. Hyperplasia of mammary glands is often manifested as breast swelling and pain, and palpation of breast has nodules. Its harm lies not in the disease itself, but in psychological pressure, worrying about whether you will get breast cancer or become cancer in the future. There are many pathological types of breast hyperplasia, such as simple lobular hyperplasia (accounting for most of breast hyperplasia). As long as we pay attention to adjusting our mentality and relieving the pressure, it is possible to gradually ease it. If lobular hyperplasia of breast is accompanied by ductal epithelial hyperplasia and presents severe dysplasia, it belongs to precancerous lesions (accounting for a very small part), and it needs active treatment and regular examination to prevent problems before they occur.