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Heart Disease Health Center

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Myocarditis

Affecting several thousand Americans each year, myocarditis is a disease marked by inflammation of the heart muscle (myocardium). Exactly how many people are affected is hard to know because myocarditis often produces no symptoms.

A wide range of infections and other problems can lead to myocarditis, which often develops in people who are otherwise healthy. Prevention or prompt treatment of infections is one of the best ways to prevent myocarditis.

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Causes of Myocarditis

Viral infection is the most common cause of myocarditis.

When you have an infection, your body produces cells to fight infection. These cells also release chemicals. If the disease-fighting cells enter your heart, they can release chemicals that can damage your heart muscle. Your heart may become thick, swollen, and weak. Seeking immediate medical care for infections can help prevent complications.

These are some of the types of infections that can cause myocarditis.

Viral infections

Bacterial infections

Fungal and parasitic infections can also cause myocarditis.

Other causes of myocarditis include certain chemicals or allergic reactions to medications or toxins such as alcohol, drugs, lead, spider bites, wasp stings, or snakebites and chemotherapy and radiation therapy. Having an autoimmune disease such as lupus or rheumatoid arthritis that causes inflammation throughout your body may also lead to myocarditis.

Signs and Symptoms of Myocarditis

Myocarditis often has no symptoms. In fact, most people recover and never even know they had it.

If you do have symptoms, they may include one or more of these:

  • Shortness of breath during exercise at first, then at night while lying down
  • Abnormal heartbeat, which causes fainting in rare cases
  • Light-headedness
  • An often sharp or stabbing chest pain or pressure, which may spread to neck and shoulders
  • Fatigue
  • Signs of infection, such as fever, muscle aches, sore throat, headache, or diarrhea
  • Painful joints
  • Swollen joints, legs, or neck veins
  • Small amounts of urine
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