Myocarditis is inflammation of the heart muscle (cardiomyopathy). Myocarditis can affect the heart muscle and the heart’s electrical system, reducing the heart’s ability to pump and causing fast or abnormal heart rhythms (arrhythmias)
Symptoms
Abnormal, fast heart rhythms (arrhythmia)
Shortness of breath at rest or during physical activity
Fluid retention and swelling in the legs, ankles, and feet
Exhaustion
Other signs and symptoms of a viral infection, such as headache, body aches, joint pain, fever, sore throat, or diarrhea