Hidden pain above the left breast of men may be caused by trauma, breast hyperplasia, breast fibroid, lung disease and other reasons. 1. Trauma: When men suffer from violence or impact injuries above the left breast, it will easily lead to soft tissue damage and vague pain above the left breast. 2. Breast hyperplasia: If a man suffers from breast hyperplasia, the enlarged breast glands may press on the surrounding blood vessels and nerves, resulting in vague pain above the left breast. 3. Breast fibroma: If men suffer from breast fibroma, it may be caused by secondary infection or tumor enlargement that presses the surrounding tissues, resulting in vague pain on the top of the left breast. 4. Lung disease: when men have left-sided spontaneous pneumothorax or lung infection and other diseases, it may produce vague pain above the left breast. In addition, breast cancer, mastitis, breast cysts, chest wall disease, heart disease may also appear similar symptoms, men with vague pain above the left breast, should immediately go to the hospital, identify the cause of the disease and then under the guidance of the doctor, so as not to delay the condition.