Myocarditis and Cardiomyopathy

Myocarditis is inflammation of the heart muscle (myocardium). The inflammation can reduce the heart's ability to pump blood. Myocarditis can cause chest pain, shortness of breath, and rapid or irregular heart rhythms (arrhythmias).

Infection with a virus is one cause of myocarditis. Sometimes a drug reaction or general inflammatory condition causes myocarditis.

Severe myocarditis weakens the heart so that the rest of the body doesn't get enough blood. Clots can form in the heart, leading to a stroke or heart attack.

Treatment for myocarditis may include medications, procedures or surgeries.

Symptoms

Some people with early myocarditis don't have symptoms. Others have mild symptoms.

Common myocarditis symptoms include:

Chest pain
Fatigue
Swelling of the legs, ankles and feet
Rapid or irregular heartbeat (arrhythmias)
Shortness of breath, at rest or during activity
Light-headedness or feeling like you might faint
Flu-like symptoms such as headache, body aches, joint pain, fever or sore throat

Sometimes, myocarditis symptoms are like a heart attack. If you are having unexplained chest pain and shortness of breath, seek emergency medical help.

Myocarditis in children

When children develop myocarditis, symptoms may include:

Breathing difficulties
Chest pain
Fainting
Fever
Rapid breathing
Rapid or irregular heart rhythms (arrhythmias)