Myocarditis is an acute or chronic inflammatory disease of the heart, with the potential to cause myocardial necrosis. Acute myocarditis rarely occurs alone, but is often accompanied by inflammation of the endocardium and pericardium.

The diagnosis of myocarditis is often confused with other heart conditions because of the similar symptoms. Therefore, in order to accurately distinguish myocarditis, the patient will be asked to perform a number of necessary tests.