Pain above the left nipple in men may be caused by overwork or mental factors, and may also be caused by intercostal neuralgia, myofasciitis, breast cancer and other diseases. It is recommended to go to the hospital to do relative examination in order to clarify the cause of the disease. 1. Overexertion or mental factors: staying up late, not paying attention to rest for a long time may trigger a transient pain in a certain part of the body. Or long-term anxiety, depression, tension and other states, it may trigger a transient pain. But physiological pain is generally able to relieve themselves, do not need special treatment. 2. Intercostal neuralgia: It refers to the syndrome of striated pain in the chest, intercostal area or abdomen due to the damage of intercostal nerves for different reasons. 3. Myofasciitis: refers to aseptic inflammation of muscles and fascia, with pain as the main clinical manifestation. It can occur in many parts of the body, among which neck, shoulder and lower back are more common. 4. Breast cancer: men also have the possibility of breast cancer, which is manifested by lumps and pain in the lesion area. The pain above the left nipple of men may also be caused by benign breast diseases, such as male breast hyperplasia. It is recommended that patients pay attention to the combination of work and rest, and maintain a good state of mind. If the pain continues to worsen or has not been improved, it is recommended to go to the hospital for examination in a timely manner, so as not to delay the condition.