Time: 5 to 7 days after menstruation Location: well-lit bathrooms and bedrooms with appropriate temperature 1.Visual examination Take off your shirt and do a bilateral breast visual examination in bright light facing a mirror: drop your arms and observe whether the curved contours of both breasts have changed and are at the same height, whether there is peeling or erosion of the skin of the breasts, nipples and areolas, whether there is orange peel-like edema on the surface of the breasts, dimple-like If there are any orange peel-like edema, dimples, or swelling marks on the surface of the breast, and if the nipple is raised or retracted. Then cross your arms and press hard to tense up the chest muscles, rotate your body from side to side and continue to observe the above changes. 2.Palpation Take a standing, sitting or supine position. During the examination, use the first knuckle of the index finger, middle finger and ring finger to make small circles on the breast tissue to check whether there are hard lumps. When making small circles, massage the fingertips close to the skin and do not leave the skin. You can apply moisturizer or toner to the breast area for massage, or massage on wet skin after bathing. Most breast tumors occur in the upper outer part of the breast. The examination should include all breast tissue, starting from the armpit, extending to the rib cage under the breast, across to the anterior sternum, up past the clavicle, then across the front shoulder and back to the armpit. Examine the right breast with the left hand while the right arm is bent at a right angle upward and flat. Then examine the left breast with the right hand and repeat the same position. After examining the breast, gently squeeze the nipple with the index and middle fingers to observe whether there is any abnormal discharge. Through the examination, if lumps or other abnormalities are found, go to the hospital for further examination in time. When examining the breast at each step, use different levels of pressure: first use light pressure, then medium pressure, then intensify the pressure until the examination spreads throughout the breast tissue. Remember not to use your fingers to grasp and pinch the breast tissue, which will artificially cause the illusion of swelling; do not miss a part of the examination to prevent missing the opportunity to find the tumor. In order to prevent the missed parts of the examination, the examination can be performed in a certain fixed order, such as: 1.Zoning method: gradually move from the upper part of the breast to different partitions, and systematically check the presence of masses in the outer upper quadrant (including the tail and axilla), outer lower quadrant, inner lower quadrant, inner upper quadrant, central zone (nipple and areola area). 2, concentric circle method: concentric circle touch starts with a large circle along the outside of the breast, and the same finger draws some small circles around the breast, gradually moving toward the center of the breast until it reaches the nipple. 3, the clock method: radial touch in the mind imagine the breast as a clock. Start touching from the nipple to 12 o’clock, then to 1, 2, 3 …… o’clock and so on until the entire breast is examined. 4, tape method: up and down touch the breast imagine a series of vertical “tape” with your fingers along each “tape” up and down touch, in the process of touching around the breast, use your fingers to draw some small circles, until the whole breast are examined once.