Breast self-examination is mainly detected through visual, tactile and lying down methods. 1. Observation: You need to face the mirror with your hands hanging down, look carefully at both sides of the breast to see if the size is symmetrical, make clear whether there is any abnormal protuberance, and see if there is any depression or eczema on the surface of the breast skin or nipple. 2. Touch: Touch the breasts clockwise to find out if there are hard lumps in the breasts until the whole breast is examined. 3. Lying down: Lie flat on your back and repeat the above touching motion to check both breasts for problems. Although breast self-examination may be able to detect problems, you need to cooperate with the doctor to go to the hospital regularly for medical checkups, which is conducive to early detection and diagnosis of diseases.