Breast cancer is one of the common malignant tumors in women. Male breast cancer accounts for about 1% of breast cancer cases, and its age of onset is slightly older than female breast cancer, between 50 and 60 years. The etiology of male breast cancer is not clear, but the factors associated with it are: hypogonadism or hypoplasia, long-term application of exogenous estrogens, and liver malfunction. Studies have shown that an average of two drinks a day or more than 24g of alcohol per day can increase the risk of breast cancer by about 21%. The main symptom of male breast cancer is a lump in the breast, often under or around the areola, that is hard in texture. Male breasts are smaller, so the tumor is more likely to invade the skin and pectoral muscles in the early stages, and the lymph nodes are more likely to metastasize earlier. When a breast lump is accompanied by nipple drainage or blood spill, it is often a sign of malignancy. The survival rate after surgery is similar to that of female breast cancer, but the five-year survival rate after surgery is worse for those with lymph node metastasis. Since most male breast cancers are hormone-sensitive, endocrine therapy, such as tamoxifen, is also available. Bilateral orchiectomy can also be used in advanced stage also has some palliative effect. Daily life can prevent male breast cancer by controlling diet, reducing alcohol consumption, physical exercise, avoiding hormone replacement therapy and regular medical checkups.