The causes of breast cancer have not been completely clarified so far, but its high-risk factors are commonly found in the following points: 1. Age: the chances of women suffering from breast cancer gradually increase with their age, and the age group of 45-59 years old is at the peak, and age is also related to the mortality rate of breast cancer, which is gradually increasing with the increase of age. 2. Estrogen level is related to women before menarche at the age of 12 and women after menopause at the age of 55, and estrogen level is relatively high, and this part of the patients is also prone to breast cancer; 3. When the age of the first birth increases, the incidence rate of breast cancer patients also increases, and women with the age of the first birth of more than 35 years old have a significantly higher incidence of breast cancer; 4. Women with a family history of breast cancer will suffer from breast cancer. Women with a family history of breast cancer have a much higher chance of developing breast cancer, which is 2-3 times higher than that of the normal population; 5. Women who take hormonal drugs for a long time, such as menopausal women who use estrogen or oral contraceptive drugs for a long time, are prone to develop breast cancer; 6. Breast cancer may be caused by other underlying diseases or chronic inflammation stimulation in the breast for a long time, such as chronic breast fibroids, ductal papillomas, or tumors on one side of the breast. For example, chronic breast fibroma, intraductal papilloma, or one side of the breast tumor and other medical history, can increase the risk of breast cancer; 7, there are also some overweight, obese people, because of the higher estrogen, so it is also easy to develop breast cancer.