Myocardial injury has serious and non-serious diseases, which need to be judged according to the etiology of myocardial injury. Broadly speaking, there are the following conditions: I. Cardiogenic diseases: 1. Acute myocardial infarction: The most common clinical cause of myocardial injury is acute myocardial infarction, where atherosclerosis leads to narrowing of the lumen, a relative lack of blood supply to the myocardium, or even an acute thrombus, resulting in complete occlusion. This condition patients if not actively treated, may appear cardiogenic shock, arrhythmia and many other adverse events, may endanger the lives of patients, and even cause sudden death, this situation caused by more serious myocardial injury; 2, myocarditis: myocarditis can also induce myocardial injury, such as severe fulminant myocarditis, the patient’s myocardial injury will also be very heavy, not only manifested as chest tightness, but also may The patient’s heart function is involved, causing cardiogenic shock, so this condition is also more serious. The vast majority of viral myocarditis have a good prognosis, and very few patients can die from severe arrhythmias, heart failure or cardiogenic shock. Second, non-cardiogenic diseases: 1, hyperthyroidism, anemia: patients with hyperthyroidism and anemia may have a mild elevation of troponin when blood tests are taken. The degree of myocardial damage in this case is generally not serious, and active treatment of the primary disease is sufficient; 2, small-vessel, microvascular lesions: small-vessel, microvascular lesions resulting in myocardial damage may slowly affect the function of the heart, but there is generally no life threatening; 3. Other systemic diseases: such as acute pulmonary embolism, aortic coarctation or combined severe infections can be seen with elevated troponin and cardiac enzyme profiles. These non-cardiogenic diseases, through direct or indirect immune reactions, cause damage to myocardial cells, thus inducing myocardial injury, the severity of which is also determined by the severity of the primary disease; 4, surgical trauma: if the myocardial injury is caused by surgical trauma, it usually heals gradually; 5, poisoning: myocardial injury caused by poisoning has a poor prognosis and has a greater impact on the human body.