High risk groups for breast cancer: 1, age at menarche less than or equal to 12 years old, age at menopause greater than or equal to 52 years old. 2. Those who are 40 years of age or older and have not had a pregnancy, or who have given birth at age 35 or older and are not breastfeeding. 3 . Maternal history of breast cancer or family history of ovarian cancer. 4, benign breast diseases: including fibroadenoma, cystic hyperplasia, moderate to severe atypical hyperplasia of the breast, etc. 5 . Dietary factors and postmenopausal obesity, or with diabetes mellitus. 6, endocrine factors and hormones: prolonged depression, fatigue, mood swings and estrogen therapy. 7, excessive exposure to ionizing radiation in the chest. 8, bad habits: smoking, alcohol consumption and irregular life. 9. The higher the education level, the higher the incidence of breast cancer. The risk of breast cancer is 4.1 times higher in educated people than in uneducated people. 10. Occupation: the risk of breast cancer is higher among those who are engaged in textile, wood processing, chemical industry, education and health, researchers, bank and government workers, which may be related to their socio-economic status, marriage and childbirth, and dietary habits.