We describe a case of quick recovery of myocardium damage in a 15-year-old 
adolescent with subacute thyroiditis. After 1 week of admission, his 
cardiovascular status began to show signs of improvement accompanied by the 
recovery of electrocardiogram and indicators of myocardial damage. We speculate 
that myocardium damage associated with subacute thyroiditis is a complication of 
common virus, although we did not detect any abnormal virus antibody and 
deoxyribonucleic acid in the patient's serum.