Adhering to monthly breast self-examination is very important for early detection of breast cancer. The important aspects of breast self-examination are: careful observation (one look) and careful touching (two looks). It is best to stick to once a month and choose the time 2-3 days after the end of menstruation because the breasts are very soft at this time and problems can be easily detected; for menopausal women, you can choose any day in January if it is convenient. When touching, use the end of the palm of your finger to slowly pan and gently touch your breasts in order, not missing any area, paying special attention to the outer upper part of the breast and the armpit. Steps of self-examination: 1. Observe your breasts in front of the mirror for any abnormal changes and compare them with the last examination for any differences. 2.Fold your arms over your waist to loosen your breasts and pectoral muscles and observe carefully. 3, arms up, in repeat observation as above. 4.Lying on your back on a hard bed, imagine that your breasts are divided into four parts, massage them one by one with your hands and notice if there are lumps. 5.Place a pillow or bath towel under the left shoulder, place the left hand under the head, and stretch the fingers of the right hand close together, massage around the left breast with flat pressure, and check around the nipple, paying special attention to the upper outer area of the breast and the armpit. 6.Hang your left hand down and lean it close to your side, and check the upper part of the outer left breast in the same way, from the outer part of the left breast inward to the nipple. 7. Then examine the lower outer part of the breast, outside to the nipple. 8.Check between the breast and the armpit with the same position and flattened fingers, and finally check the left armpit. 9.Repeat the above process for the right breast.