Featured Experts: Nisha Aggarwal Gilotra, M.D. Myocarditis occurs when the heart muscle becomes inflamed. When your heart muscle is inflamed, it can affect your heart’s electrical system. This can cause arrhythmia, or a rapid or abnormal heartbeat. Myocarditis can cause the heart muscle to weaken and can lead to cardiomyopathy. Johns Hopkins cardiologist and heart […]