Most of the neonatal myocardial damage is caused by hypoxia, infection with viruses or bacteria, and since neonates cannot express it, they can only rely on adults to observe the symptoms described. In mild cases, there may be no obvious symptoms, only laboratory tests suggesting elevated cardiac enzyme profile CK-MB and troponin. More severe cases may show irritability, shortness of breath, facial and perioral cyanosis, and blue or pale skin color, resembling pneumonia. Non-specific symptoms such as fever, drowsiness, vomiting, and diarrhea may also be present first. Severe disease may present with dysfunction, hemodynamic disturbances, sustained drop in blood pressure, and even cardiogenic shock, congestive heart failure, and cardio-cerebral syndrome. If the degree of myocardial injury is small, it is easier to treat. If the degree of injury is more serious, it must be treated according to medical advice.