I. Check the shape of the breast Stand facing the mirror, upper limbs relaxed and naturally drooping, observe the following: 1. whether there is any change in the shape and size of the left and right breast 2. whether there is a small depression or deformation of the breast 3. whether there is an invagination or erosion of the nipple Yi Tongbo, Department of Breast Surgery, Taizhou People’s Hospital II. whether there is a lump in the breast 1. lift both upper limbs up and observe the above, if there is a lump, check whether there is a depression at the lump or erosion. 2. Lie on your back, put a not too high pillow or a folded towel under your left shoulder, lift your left arm up and put your left hand under your head; straighten your right finger and check the inside of your left breast first. The most important thing when self-examining is not to grasp the breast with your fingers, but to straighten your fingers to examine it with your finger belly. 3.Place your right hand on the inside of the left breast and gently and carefully glide your fingers toward the center of the breast to check for lumps. 4. The position remains unchanged, the left upper limb is placed on the side of the bed, and the outside of the breast is examined by gently and carefully sliding towards the inside. 3.Can you feel the lymph nodes 1.Use a pillow or towel under the right shoulder, and instead of grasping with the left hand, straighten your fingers and check the right breast to see if you can feel the lymph nodes. 2. In a standing position, straighten your right finger and place it under your left armpit and check if there are lymph nodes with your fingertips; in the same way, check if there are lymph nodes in your right armpit. Fourth, whether there is secretion overflowing from the nipple Gently grasp the nipple after bathing to see if you can squeeze out bloody or plasma secretions. If no lump or abnormal nipple discharge is found in the breast according to the above method, you can sleep peacefully.