Viral myocarditis, a pathological change of inflammation of cardiac muscle due to the viral invasion of the heart, is clinically marked by listlessness, hypodynamia, pale complexion, palpitation, short breath, cold limbs, polyhidrosis, etc.. There is not such a name for the disease in TCM. But descriptions of similar symptoms exist. The disease pertains to the categories of "fengwen" (wind-warm syndrome), "xinji" (palpitation), "zhengchong " (severe palpitation), "xiongbi" (obstruction of qi in the chest), etc.. The disease may occur during the four seasons, but prevails in spring and autumn. Children at the age of 3 to 10 are susceptible to it. Clinical manifestations of the disease vary in severity. Most infantile patients have a favourable prognosis, they may recover in half a year to one year. The disease may become chronic in a few patients; failure to be treated instantly may endanger patients' life.