Myocarditis is an inflammatory change in the heart muscle cells and is a serious condition that will affect the normal work of the heart once it occurs. Abnormal changes such as arrhythmias, heart failure, respiratory distress, and even life-threatening conditions may occur. Myocarditis is often caused by bacterial or viral infections, and its diagnosis can be clarified by electrocardiogram, cardiac enzymes, cardiac ultrasound and other related tests, and the diagnosis needs to be confirmed by viral antibody assay. The treatment of myocarditis is mainly anti-infective or anti-viral and restores the function of heart cells in time. Once the heart cells are necrotic, they cannot be regenerated, so timely treatment is especially important. It is recommended to avoid exertion, cold and flu, proper physical activity, and avoid strenuous exercise.