This handbook presents an important account of Myocarditis. Myocarditis is basically described as the inflammation of the heart muscle, which can turn out to be severe and potentially fatal in certain cases. This is an elaborative book consisting of a collection of analyses from top-notch international veterans on several aspects of myocarditis. It presents a clinical outlook on the disease and discusses elucidative reviews regarding its causes, diagnosis, treatment, and classification and also encompasses reviews of myocarditis in HIV-positive patients. The book also highlights the pathogenesis of myocarditis, elucidating mechanisms and pathways activated during viral infection and host immune reaction during the disease along with novel findings in the pathogenesis which may result in novel directions for clinical diagnosis, including utilization of novel biomarkers, and latest treatments of myocarditis.