Some people in daily life, “cold” after the cure, there will be chest tightness, panic, etc., then go to the hospital, the doctor will say “myocarditis” may be. The following is about “myocarditis”. 1, acute myocarditis is due to a variety of infectious and non-infectious factors caused by myocardial damage to inflammatory changes in the disease. Common infectious causes include viruses, bacteria, fungi, parasites, protozoa, etc. Non-infectious causes include cardiotoxins, hypersensitivity reactions, systemic diseases and radiation. The most common in daily life is viral infection, which mainly includes pathogens such as adenovirus, microvirus, hepatitis C virus, herpesvirus 6 and so on. 2, acute myocarditis has a variety of clinical manifestations, which can be manifested as a subclinical state, or weakness, chest pain, chest tightness, panic, heart failure, cardiogenic shock, arrhythmia, and even sudden death. If after a cold or diarrhea, in a short period of time (generally 1-2 weeks after the disease) the above symptoms such as panic, chest pain, chest tightness and shortness of breath, fatigue, pallor, sweating, dizziness, precordial discomfort or convulsions, that should be highly alert to suspect that the “myocarditis” may be, should not be taken lightly, and need to find a doctor’s office early. 3. To confirm the diagnosis, endomyocardial biopsy (the gold standard for the diagnosis of acute myocarditis) is usually required. In addition, some auxiliary tests such as electrocardiogram can have non-specific manifestations. Cardiac biomarkers such as pro-brain natriuretic peptide, troponin, and cardiac enzyme profiles can be elevated, but are not specific. Respiratory viral profiling may be abnormal. In severe heart failure, echocardiography may reveal left ventricular enlargement, left ventricular structural changes, generalized or segmental ventricular wall motion abnormalities, and reduced ejection fraction. 4.Treatment is mainly symptomatic, such as diuretic therapy to correct heart failure, glucocorticoid therapy can be given when necessary, but also to correct arrhythmia. Severe cases require mechanical circulatory support and heart transplantation.