Cold can cause myocarditis, the symptoms can be mild or severe, mild myocarditis can not have any symptoms, but if serious can appear heart failure, arrhythmia, a variety of serious arrhythmia is mainly ventricular arrhythmia, but also can appear cardiac arrest, sudden cardiac death and a series of performance. Generally, myocarditis caused by the cold will show the following clinical characteristics: 1, first of all, 1-3 weeks before the onset of the disease is often a precursor to respiratory infection or intestinal infection, that is, the onset of the syndrome; 2, the cold caused by myocarditis is mainly common in adolescents, especially children, generally more males than females, and with the younger the age is often more serious; 3, after the cold myocarditis for The main manifestation of the heart is panic, palpitations, chest tightness, sometimes there can be chest pain and even confused with acute myocardial infarction. Some of the symptoms of the cold can be atypical, performance in many aspects such as can appear simple chest pain, can also appear panic, palpitations as the first manifestation, generally fainting as the main manifestation, can also appear arrhythmia, atrioventricular block and even sudden death, there are also viral myocarditis, cold combined with myocarditis, the patient will appear other than the performance of heart damage, such as generalized aches and pains, muscle weakness, joint pain, etc. The patient will have an enlarged heart or tachycardia, and the tachycardia is usually >120 beats/min, and the rate of tachycardia and body temperature are often inconsistent, and bradycardia can occur when combined with conduction block. Therefore, myocarditis caused by cold is often characterized by arrhythmia.