Myocarditis is a condition that causes inflammation in the muscles of the heart, the myocardium. As a result of illness or a bad reaction to a chemical, the myocardium becomes swollen, or inflamed, which makes it harder for the heart to pump blood. This can also disrupt the heart’s electrical system, causing an irregular heart beat.

Usually, myocarditis is mild and goes away on its own. But serious cases, if not treated, can damage the heart.

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What Are the Signs and Symptoms of Myocarditis?

Mild cases of myocarditis may not have any symptoms. More serious cases may cause the following:

  • Chest pain
  • Rapid, pounding or uneven heartbeat
  • Trouble breathing
  • Feeling very tired
  • Passing out
     

What Causes Myocarditis?

For most kids, myocarditis is caused by a viral infection, including a common summer infection called coxsackie virus.

For all ages, possible causes include:

  • Viral infection, including COVID-19
  • Bacterial infection
  • Fungal infection
  • Immune conditions and autoimmune disorders
  • Allergic reactions
  • Unusual reaction to a medication
  • Medicines used to treat cancer
  • Eating or drinking a poisonous chemical
     

How is Myocarditis Treated?

Most cases go away on their own, without long-term effects.

If a case is more serious, it may require medicine to treat both the cause, like the original viral infection, and any symptoms. Doctors usually recommend avoiding major exercise for several months until the heart has completely recovered.

To know exactly what’s happening in the heart, doctors may use advanced cardiac imaging like cardiac magnetic resonance imaging (MRI). Connecticut Children’s 3T scanner shows 3D images of the heart, its tissues and how blood is flowing through it. This state-of-the-art technology is also fast – part of our comfortable and kid-friendly experience.