The incidence rate of male breast cancer is relatively low, about 2 in 100,000, and the incidence ratio of men to women is about 100/1. Due to the improvement of medical level and the promotion of science, the awareness of the disease is gradually deepened and more and more patients are seen at an early stage. Clinical manifestations: The patient often comes to the hospital with a painless swelling under the areola. After further examination, surgery and puncture pathology can be performed, and if the tumor develops further, it will invade the nipple and pectoralis major muscle, with serious consequences. Treatment: Surgery is the main treatment, together with chemotherapy and radiotherapy. Endocrine therapy, immunotherapy and with traditional Chinese medicine. It is important to emphasize that since the male breast is not developed, the tumor can easily invade the muscle below. Early surgery and biopsy are needed for clear diagnosis. The clinical staging is the same as that of female breast cancer. After surgery, skin graft is needed, and whether the skin graft is viable or not is a test for the surgeon’s skill level. The lymph nodes in the axilla need to be cleared, especially the lymph nodes at the entrance of the axillary vein in the axilla.