Breast cancer is one of the most common malignant tumors in women, occurring mostly in women around the age of 40-60 years old during menopause. Breast cancer also occurs in men between the ages of 50-60. Its incidence is related to endocrine factors, genetic factors, benign breast diseases, environmental life factors and obesity factors. The prevention of breast cancer in daily life can effectively reduce the occurrence of cancer. The main preventive measures are: 1. Promote breastfeeding, reduce fat intake after menopause, have regular medical checkups after 20 years old, especially for men, and learn self-examination and regular screening for high-risk groups such as those with family history of genetic predisposition. In China, breast ultrasound combined with mammography is generally recommended as a screening method. 2. Reduce the intake of exogenous estrogen, such as cosmetics, etc. 3.Keep your weight within a manageable range. 4. Develop good lifestyle habits, such as avoiding high-fat and high-sugar intake, reducing the frequency of staying up late, relaxing, and eating more fresh vegetables and fruits and vitamin-rich foods. 5, early treatment of benign breast diseases, do not indiscriminately use drugs and massage the breast. In addition, you should learn more about breast cancer in your daily life. If you find a painless lump in your breast, or a painful lump with hard texture and unclear boundary, you should seek medical treatment as soon as possible.