What are the early symptoms of myocarditis? In fact, most patients with myocarditis typically exhibit acute onset of symptoms, which generally occur 1 to 3 weeks after cardiac involvement, or they may simultaneously exhibit various degrees of viral infection symptoms such as fever, sore throat, cough, general malaise, muscle pain, skin rash, or nausea and vomiting, abdominal pain, and diarrhea. These are its prodromal symptoms. Additionally, some patients exhibit systemic viral infection symptoms when the disease occurs, such as rubella, measles, epidemic mumps, viral hepatitis, and other diseases. Since the recovery rate of myocarditis in the acute and recovery phases is significantly higher than in the lingering or chronic phases, it is evident that treatment for myocarditis should be initiated as early as possible to increase the recovery rate.