The cause of breast cancer is not yet fully understood, but research has found that there is a certain pattern in the development of breast cancer, and women with high risk factors for breast cancer are prone to develop breast cancer. The so-called high-risk factors refer to the various risk factors associated with the development of breast cancer, and the risk factors that most breast cancer patients have are called high-risk factors of breast cancer. According to the annual report of Chinese tumor registry, the incidence rate of breast cancer among women in the age group of 0-24 is low, gradually increases after the age of 25, reaches a peak in the age group of 50-54, and gradually decreases after the age of 55. Family history of breast cancer is a risk factor for the development of breast cancer, which refers to the presence of a first-degree relative (mother, daughter, sister) with breast cancer. Recently, dense breast gland has been found to be a risk factor for breast cancer. Other risk factors for breast cancer include early menarche (<12 years old) and late menopause (>55 years old); unmarried, infertile, late childbearing, not breastfeeding; untreated benign breast diseases; atypical breast hyperplasia confirmed by hospital biopsy (biopsy); high dose of radiation to the chest; long-term use of exogenous estrogen; postmenopausal obesity; long-term excessive alcohol consumption; and carrying mutations related to breast cancer. The risk of breast cancer is high. It should be explained that a lot of research has been done in Europe and the United States on breast cancer susceptibility genes, and the known ones are BRCA-1, BRCA-2, p53, PTEN, etc. Breast cancer related to these genetic mutations is called hereditary breast cancer, which accounts for 5% to 10% of all breast cancers. Therefore, women who do not have a family history of breast cancer do not mean that they will not develop breast cancer. Among the factors for the development of breast cancer, except for menstrual age and genetic factors which cannot be changed, other risk factors such as excessive mental stress, unbalanced diet, lack of exercise and other risk factors that can cause breast cancer are closely related to our daily life. Therefore, we should develop good living habits, actively prevent against the causative factors, change bad habits, strengthen exercise, avoid smoking and drinking, and moderately relieve stress in order to prevent the disease before it happens.