Breast cancer is a malignant tumor that occurs in the epithelial tissue of the breast. 99% of breast cancers occur in women and only 1% in men. Early stage breast cancer does not have obvious typical signs and symptoms and is not easy to attract attention. It is usually detected through physical examination or breast cancer screening, and its main symptoms: a. Breast lumps. 80% of breast cancer patients are first diagnosed with breast lumps. Most of them are painless, and only a few of them can be accompanied by varying degrees of hidden pain or stabbing pain. Second, nipple overflow. Bloody nipple overflow, further examination should be done. Skin changes can be accompanied by dimple sign or orange peel-like changes, resembling abnormal nipple or areola. When the tumor is located deep in the nipple or close to the deep part, it can cause nipple retraction. The lymph nodes in the axilla are enlarged. When the above symptoms appear, special attention should be paid to them. If necessary, surgical treatment can be performed and pathological biopsy can be done after removal to clarify the diagnosis.