The traditional concept of “breast cancer is only when there is a lump” must be changed and a new concept of “early stage breast cancer may not always be able to detect a lump” must be established. 2. Pay attention to people with high risk of breast cancer. 3. Learn breast self-examination once a month, 7-10 days after menstruation, and go to the hospital in time if abnormalities are found. 4. Carry out in-depth breast cancer screening.