The etiology of breast cancer is not yet clear, but studies believe that it is related to the following high-risk factors: 1) early menarche and late menopause: a relatively longer exposure to estrogen and an increased risk of breast cancer; 2) genetic factors: immediate family members suffering from breast cancer, and their close family members belong to the high-risk group of breast cancer, but breast cancer is not a hereditary disease; 3) lifestyle habits: such as alcohol abuse, staying up all night, eating a good high-fat diet and a lack of physical activity, and so on; 4) exogenous estrogens: is one of the high-risk factors for breast cancer.