Explain the condition called inflammation of the heart (carditis).?

Myo and pericarditis: Inflammation can be of the heart muscle (myocarditis) or of the lining of the heart (pericarditis). Myocarditis is often viral and sometimes can lead to heart failure; symptoms can be chest pain, shortness of breath, palpitations and generalized malaise. Pericarditis has many causes and may lead to fluid accumulation around the heart. Main symptom is chest pain, especially when lying down.

There are 2 types: Pericarditis which is inflamtion of the sac of the heart or the outer membrane mostly due to virus and myocarditis which is inflamtion of the heart muscle and is much more serious and could lead to heart failure.