Myocarditis, a rare heart condition that can stem from some common viruses and bacterial infections, often affects young people, has very few symptoms, and goes largely undiagnosed.
Unlike atherosclerosis, which is commonly linked to heart attacks, and involves your vessels and arteries, Myocarditis is an inflammation of the heart muscle itself and is often caused by viral infections, like Coxsackie (a.k.a. hand, foot, and mouth disease), influenza, hepatitis B, hepatitis C, or HIV.