Inflammation of the muscle wall of the heart, caused by a viral infection. A cold or influenza virus, for example, may attack, inflame, and irritate the cardiac muscle causing varying degrees of pain and disturbance of the rhythmical beating of the heart. Viral myocarditis can cause circulatory collapse if the sufferer exercises at a high intensity, no matter how fit the person was before infection. See also myocarditis.
Subjects: Sports and Exercise Medicine.