Patients with myocarditis can develop high fever as well as low fever, which is directly related to the patient’s constitution, the level of immunity, the presence of other primary underlying diseases, and the ability of the virally infected host to excrete the virus. For patients who are weak and have more primary underlying diseases and relatively poor viral infectivity and resistance, such patients are prone to high fever. For patients with relatively good constitution and relatively strong ability to exclude viruses, they are prone to low fever and must be treated systematically regardless of whether the patient has high or low fever. For example, if a patient develops dizziness, headache, palpitations, chest tightness, shortness of breath, weakness, dyspnea, and swelling, the possibility of fulminant myocarditis is considered, and systemic treatment must be given regularly.