Carditis is an inflammation of the heart or its surrounding tissues. It can affect the heart muscle itself, known as myocarditis, the outer lining called pericarditis, or the heart valves, referred to as endocarditis. This condition can result from infections, autoimmune diseases, or exposure to certain medications. Symptoms of carditis may include chest pain, fatigue, shortness of breath, and irregular heartbeats. Diagnosis typically involves medical history, physical examinations, and tests such as echocardiograms or blood tests. Treatment depends on the underlying cause and may include medications, lifestyle changes, or, in severe cases, surgery.