Current scientific progress has not yet been able to fully explain the causes of breast cancer, but the following are the generally accepted risk factors for breast cancer: 1. Women with first-degree relatives (parents, siblings, children) who have breast cancer are two to three times more likely to develop breast cancer themselves. 2. People with certain benign breast diseases. The risk of breast cancer is related to the histological type of benign breast disease, and it is common to use “non-proliferative” and “proliferative” lesions to distinguish the different risks. Non-proliferative lesions do not increase the incidence of breast cancer, while the relative risk of breast cancer increases in proliferative lesions, especially in those with lobular or ductal atypical hyperplasia. Early menarche (before the age of 12) or delayed menopause (after the age of 55). 4.Women who have never had children or late childbirth (after 35 years of age) and women who have not breast-fed after childbirth. 5.After menopause, overweight.