Myocardial damage is clinically called myocardial injury and is an umbrella term for a range of disorders that can be significant or minor in severity, depending on the disease and the extent of the injury. Clinically, various types of damage or necrosis of myocardial cells can cause an increase in myocardial enzyme profile and troponin, a change called myocardial injury. There are many diseases that can cause myocardial injury, which can be mainly divided into cardiogenic and non-cardiogenic diseases.1. Cardiogenic diseases: such as acute myocardial infarction, myocarditis, etc., may cause myocardial injury. Both of these diseases are more serious, because they may cause extensive myocardial necrosis, induce heart failure, malignant arrhythmias, etc. Patients may suffer sudden death. Of course, there may also be small symptoms of myocardial necrosis, causing only a mild increase in myocardial enzyme profile and troponin, the consequences of this situation are relatively speaking not serious; 2, non-cardiogenic diseases: In addition to cardiogenic diseases, other parts of the body or organ abnormalities, may cause specific or non-specific myocardial injury, clinically common, such as severe infection, pulmonary embolism, aortic coarctation, acute cerebral infarction, etc. All of these diseases have the potential to cause myocardial injury, resulting in elevated myocardial enzyme profiles and troponin, which are also more serious, and all of these diseases have the potential to bring about clinical adverse events that may endanger the patient’s life. In addition, myocardial injury can also be caused by milder causes, such as anemia or renal insufficiency, which may cause myocardial injury, but the vast majority are not life-threatening and may be reversed after treatment of the cause, with myocardial injury returning to normal. Therefore, the severity of myocardial injury depends largely on the underlying cause of the patient.