Breast cancer that is detected early can be cured for life with timely treatment. If detected late, treatment is not as effective. The breast gland is long on the surface of the body, which is conducive to early detection, but because of the lack of conscious symptoms in the early stage of breast cancer, many patients are far from the early stage when they are found, and the breast cancer that can be felt is usually above 2 centimeters, and their tumors have grown for 3-6 years. Therefore, in order to detect breast cancer at an early stage, it is very important to popularize the knowledge of cancer prevention. Women above middle age should have some knowledge about breast cancer and have a regular (every month) self-examination of breast, if they find breast lumps or breast thickening, or nipple overflow, or nipple elevation or invagination, they should consult a breast surgeon for further examination to confirm the diagnosis. However, do not be alarmed. The latter is characterized by swelling and pain in the breast, which occurs or worsens in the premenstrual period and disappears or decreases after the menstrual period, and is cyclical. The lumps found in the breast are nodular or granular, tough but not hard, indistinguishable from the surrounding normal breast tissue, without adhesions, and shrink after menstruation. A small number of breast hyperplasia can develop into, and sometimes it is difficult to distinguish from early breast cancer, which is subject to further examination by breast surgeons. If cancer is highly suspected, X-ray mammography, ultrasound, endoscopic examination of breast ducts and cytological examination of lump aspiration can be done. The final diagnosis often requires excision of the lump for pathological examination or intraoperative frozen section examination.