Myocarditis is an inflammation of the heart muscle, known as the myocardium. This condition can affect the heart's ability to pump blood effectively and can lead to various symptoms, including chest pain, fatigue, and shortness of breath. It can be caused by infections, autoimmune diseases, or exposure to certain toxins. Diagnosis typically involves medical history, physical exams, and tests like electrocardiograms or echocardiograms. Treatment may include medications to reduce inflammation and manage symptoms. In severe cases, hospitalization or more advanced interventions may be necessary to support heart function.