Liu Dong, Department of Surgery, Benxi Railway Hospital Breast disease is the most common disease among women, and it bothers women at any time. Breast diseases can be self-checked, and learning a little self-diagnostic method can help to detect breast diseases early and buy valuable time for treatment. Seven to ten days after each menstrual period is the best time for breast self-examination, because at this time breast nodules and tenderness are least obvious, which is conducive to a clear diagnosis. After the age of 30 to 35, women should do self-examination once every month and once every six months by a doctor. First, visual inspection: Remove the upper garment in front of the upright mirror, under the bright light, face the mirror for visual inspection of both breasts, compare the symmetry of both breasts when the hands are naturally hanging down (Fig. 1), the hands are crossed (Fig. 2) and the hands are lifted up (Fig. 3) and pay attention to the appearance of the breasts with or without the size and abnormal changes. Abnormal signs include: nipple overflow, nipple retraction, skin wrinkles, dimple sign, skin desquamation and abnormal changes in breast contour. First, raise the left arm (Figure 4), put the three or four fingers of the right hand together, and carefully touch the left breast with the abdomen of the fingers, and make a small circle movement while touching. Gradually move the left breast forward in a smooth or reverse direction (Figure 5), making at least three circles from the periphery of the breast to the nipple. It is also possible to examine in an up-and-down (Figure 6) or radial (Figure 7) direction. After a light touch reveals an abnormality, it can be changed to a deeper touch. In order that palpation does not miss a certain part, after completing the above steps, gently press the areola area with the hand (Figure 8), and watch for spillage when the nipple is pinched. Do not miss the examination of the subaxillary region and the area between the axilla and the breast. The breast should be touched rather than lifted during the examination. Finally, the right breast is examined with the left hand in the same way. The purpose of the examination is to look for nodules, lumps or nipple discharge. Lying down to examine the breast (Figure 9). Lie on your back with a pillow under your left shoulder and raise your left hand over your head so that the breast is spread evenly over the chest wall so that your fingers can easily reach the deep breast cancer. Palpate using the digits of the index, middle, and ring fingers rather than the fingertips. Palpation should be done in a circular motion, turning laterally from the nipple outward, so as not to miss the underarm area. Finally, gently squeeze each nipple to check for nipple discharge. If you find any abnormality, be sure to visit the hospital promptly. Have a doctor make a professional diagnosis.