The correct order of breast self-examination is to start with the outer side, follow the outer upper and lower, then proceed to the inner side from the inner lower and inner upper to touch the nipple in turn, and finally check the armpit. If any abnormality is found when touching, record it according to the location, size and activity boundary found, and promptly go to a regular hospital for an ultrasound examination and further examination to confirm the diagnosis and treatment according to the ultrasound examination results. Self-examination of the breast can detect most tumor masses in the breast at an early stage, so it is recommended that all adult women try to master it and can self-examine at any time. Most breast diseases can be initially diagnosed by mammography, and if necessary, biopsies can be taken for pathological examination. The breast will be directly affected by mood factors, usually try to keep a happy mood, do not be irritable, often angry, also need to pay attention to life, work stress not too much.