Any of the following abnormalities should be seen at the hospital: 1. A small, painless, hard lump in the breast. 2.Depression of the nipple. 3. Abnormal discharge from the nipple, especially bloody. 4.Changes in the shape of the breast, such as localized depression or projection. 5. “Orange peel” changes or edema or ulceration of the breast skin. 6. Enlarged lymph nodes in the axilla. Note: (1) 70%± of breast cancers are detected by patients themselves, and the best time to check is 7-11 days after menstruation. (2) Early diagnosis of breast cancer is made by doctors. (3) Self-examination is more reasonable once a month. (4) Do not go more than six months between examinations. The interval between self-examinations should be shortened with age. Breast examination is mainly visual and palpation. For lumps in enlarged breasts, it is easy to find the lesions only when the chest is elevated with a pillow under the shoulder in the lying position. Breast self-examination method 1, hands in the mirror, observe the shape of both breasts, the outline of any abnormalities. 2, raise both arms and carefully observe the shape of both breasts, skin and nipple outline for any abnormalities. 3.Touch the right breast with the left hand and the left breast with the right hand to find out if there are any lumps. 4.Lying on your back with your shoulders slightly elevated, raise your right (left) upper arm and touch the right (left) axillary caudal lobe of the breast with your left (right) hand for any lumps.