Menu Healthy Lifestyle Diseases & Conditions First Aid Symptoms Tests & Procedures Videos Definitions FAQs MyocarditisUpdated: 2017-06-13OverviewMyocarditis is usually caused by a viral infection. A severe case can weaken the heart leading to heart failure, abnormal heartbeat, and sudden death. SymptomsSymptoms include chest pain, abnormal heartbeat, and shortness of breath. TreatmentsTreatment may include medication to regulate the heartbeat and improve cardiac output. Severe cases may need a device to help the heart function. © 1998-2022 Mayo Foundation for Medical Education and Research(MFMER). All rights reserved. Terms of Use