Myocarditis is an inflammatory disease of the myocardium. In treating it, reducing the cardiac load is crucial. For patients in the acute phase, rest is the best way to reduce cardiac load and is an important treatment measure for acute myocarditis. If a patient's heart condition, such as chest pain, elevated myocardial enzymes, or troponin, or severe arrhythmias, is present, we often recommend that the patient rest in bed for more than three months. Therefore, patients with myocarditis should avoid exertion and rest appropriately.