Breast tissue includes parenchyma and interstitium, and interstitium is generally composed of fibrous and fatty tissues. During the development of breast during puberty, due to estrogen stimulation, the parenchyma and interstitial components of the breast grow larger simultaneously. However, some fibrous tissues are more sensitive to estrogen stimulation and grow faster, resulting in fibroadenomas that can be felt or detected by ultrasound. Therefore, breast fibroadenoma has the following characteristics: 1. high incidence. 2. more common in young women. Li Peng, Department of Breast and Thyroid Surgery, Peking University Shenzhen Hospital 3. The treatment principle of smaller ones, which can not be felt can be positioned for review. For larger ones, those that can be felt can be considered for surgical removal, especially those near the nipple areola. If you’re looking for a new one, you’ll be able to get a new one.