Myocarditis refers to the inflammatory disease of the myocardium, with viral infection being the most common cause. Therefore, the majority of patients exhibit precursor symptoms of a viral infection one to three weeks before onset, such as fever, general fatigue, muscle soreness, or gastrointestinal symptoms like nausea and vomiting. This may be followed by palpitations, chest discomfort, chest pain, difficulty breathing, edema, and even fainting or sudden death. In the clinical diagnosis of myocarditis, the majority of cases initially present with symptoms of arrhythmias such as palpitations or a racing heart, but a minority may also experience fainting or Adams-Stokes syndrome (also known as cardiogenic cerebral ischemia).