Myocarditis is a condition characterized by inflammation of the myocardium, the middle layer of the heart wall responsible for its contraction. It can affect individuals of all ages and is typically caused by viral infections, although it can also result from bacterial or fungal infections, certain medications, or autoimmune diseases. The inflammation weakens the heart muscle, leading to symptoms such as chest pain, fatigue, shortness of breath, and irregular heartbeat. In severe cases, myocarditis can cause heart failure or sudden cardiac arrest, which can be life-threatening. Diagnosis involves a combination of medical history, physical examination, blood tests, electrocardiogram, echocardiogram, and sometimes a cardiac MRI. Treatment options include rest, medications to reduce inflammation and manage symptoms, and in severe cases, advanced interventions like ventricular assist devices or heart transplantation. Early detection and prompt medical intervention are crucial for managing myocarditis and preventing complications.