Myocarditis is an inflammation of the heart muscle, which can affect the heart's ability to pump blood effectively. This condition can be caused by various factors, including viral infections, autoimmune diseases, and exposure to certain toxins. Symptoms may include chest pain, fatigue, shortness of breath, and irregular heartbeats. Diagnosis typically involves medical history, physical examinations, and tests such as electrocardiograms (ECGs) or echocardiograms. Treatment depends on the underlying cause and may include medications to reduce inflammation or manage symptoms. In severe cases, hospitalization may be necessary to monitor heart function and provide supportive care.