The causes of the vast majority of breast cancers are still unknown, but some of the risk factors for their development have been confirmed: 1. Breast cancer is a sexist disease! There is no doubt that women are more likely to develop breast cancer, and only one in 100 breast cancer patients may be a man! 2. Age is an important factor in the development of the disease! The risk of breast cancer in women of childbearing age generally increases rapidly with age, slows down slightly around the time of menopause, and continues to rise thereafter. At present, the high incidence of breast cancer among women in China is between 45-55 years old, but the trend of breast cancer is now younger. 3. Young family history of breast cancer! Especially the history of pre-menopausal breast cancer in first-degree relatives, such as mother, relative sisters, etc. who were diagnosed with breast cancer before menopause. 4. Older age at first birth (≥30 years old) or not having children are risk factors for breast cancer. 5. Young age at menarche (before age 12). 6. Older age at menopause (after 50 years of age). However, regardless of the age of menarche and menopause, people who have been menstruating for a long time are more likely to get breast cancer. 7. Long-term hormone replacement therapy (5 years or more), such as estrogen therapy after gynecological surgery to remove the ovaries, or estrogen-like drugs to treat menopausal syndrome, etc. There are also a series of health products that have an effect on hormone levels: propolis, royal jelly, etc. 8.Previously received therapeutic amount of radioactive treatment to the breast. 9.History of benign hyperplastic diseases of the breast, mainly atypical hyperplasia of the breast, severe atypical hyperplasia is a precancerous lesion. 10.Carriers of BRCA1 and BRCA2 gene mutations are closely related to hereditary breast cancer and familial aggregation of breast cancer.