Myocarditis: Symptoms & Signs

Medically Reviewed on 11/1/2019

Myocarditis refers to inflammation of the muscle of the heart (known as the myocardium), leading to damage or destruction of the heart muscle.

Signs and symptoms of myocarditis include

Other associated symptoms are nonspecific, particularly in children and infants, and can include

Myocarditis is also a known cause of sudden death in young adults.

Causes of myocarditis

Myocarditis has a number of possible causes, including infections (bacteria, viruses, or fungi), autoimmune conditions, certain medications, toxins, and some diseases like lupus or Wegener's granulomatosis. In many cases, myocarditis develops without a known cause (called idiopathic).

Other myocarditis symptoms and signs


In the U.S., 1 in every 4 deaths is caused by heart disease. See Answer

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Jameson, J. Larry, et al. Harrison's Principles of Internal Medicine, 20th Ed. New York: McGraw-Hill Education, 2018.