Inflammation of the heart can have various causes. Because the heart is a muscle, The technical term for inflammation of the heart is called myocarditis.
Myocarditis can both start and run differently. The reason is in most cases a viral infection of the upper respiratory tract. Heart inflammation often occurs after a bout with the flu. Inflammation of the heart can occur with a very serious chronic disease, but usually is the result of an infection.
The fact is that a specialist should be consulted initiating immediate treatment of myocarditis to counteract possible heart failure with cardiac enlargement.