The peak age of incidence in Chinese women is between 40 and 49 years old, 10 to 15 years earlier than in Western women, and the incidence continues to rise after menopause, probably related to the increased estrone levels in older people. The breast is a target organ for many endocrine hormones, among which estrone and estradiol are directly related to the development of breast cancer. At present, the exact cause of breast cancer is not known, but according to a large number of epidemiological data surveys, the risk of breast cancer increases significantly in the following groups: 1. Family history of breast cancer, especially if the patient’s mother or sister had breast cancer, developed before menopause or had bilateral breast cancer. 2. Early menarche (before the age of 12) and late menopause (after the age of 52). 3. Not pregnant at the age of 40 or older or first full-term birth after 35 years of age. 4.Patients who have had breast cancer on one side and have high risk factors on the opposite side of the breast, especially those with pathological diagnosis of lobular carcinoma in situ or multifocal carcinoma. 5.Pathologically confirmed cystic hyperplasia of the breast, especially those with active ductal epithelial atypical hyperplasia or papillomatous structures. 6. Those who have a history of excessive chest X-ray or chest radiographs. It should be noted here that annual medical chest radiographs or mammograms of the breast do not significantly increase the risk of breast cancer. 7. Patients who have suffered from functional uterine bleeding or adenocarcinoma of the uterine body. 8. Obese patients, especially those who are significantly obese after menopause or with diabetes, such as those who are too partial to fried, deep-fried, smoked food or high-fat food. 9.Patients who use exogenous estrogen in large quantities for a long time: the risk of breast cancer is significantly increased in women who take health care products containing estrogen in large quantities for a long time, especially those who use estrogen replacement products or synthetic estrogen drugs for a long time after menopause. 10. Women with bad habits: those who have bad habits of smoking and drinking, those who have irregular life, those who do not sleep at night and do not get up in the morning, and those who are obsessed with night life for a long time will have a significantly higher risk of breast disease. 11, multiple abortion women, or sexual chaos, long-term sexual disharmony of women. 12. Those who are under great psychological pressure or have obvious great mental trauma. However, it should be noted that the risk of breast cancer for women with the above mentioned risk factors is only increased, not necessarily and not causally, that is to say, even if you have all these risk factors, breast cancer may not necessarily occur. It is not necessary to be overly nervous because women who have breast cancer are individual and very few. We recommend regular self-examinations and regular hospital examinations for those who have high risk of breast cancer, as most early breast cancers are curable and do not significantly affect the quality of life.