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Functional Heart Murmur (Child)

Cross section of heart, showing pulmonic valve, tricuspid valve, aortic valve, and mitral valve.

A heart murmur is a sound that blood makes as it moves through the heart. It may be a sign of some problem in the heart or valve structure. But in most cases, a heart murmur is completely harmless and a normal finding. Sometimes it can be a sign of a more serious issue that needs more testing or treatment. Most children have a heart murmur at some time in their life. It may be the result of a short-term (acute) illness, such as an upper respiratory tract infection, dehydration, or anemia. These murmurs come and go during childhood. They don't affect the child’s health. As the child gets older, the murmurs go away on their own. These are called benign or functional murmurs.

Home care

Benign heart murmurs don't need special care or treatment.

Follow-up care

Follow up with your doctor, or as advised. Getting regular checkups can allow your doctor to monitor for anything unusual.

When to get medical advice

Contact your doctor if any of the following occur:

In newborns and babies:

  • Trouble feeding

  • Doesn't gain weight normally

  • Blue legs or feet

In children and teens:

  • Tiredness or trouble exercising

  • Trouble gaining weight

  • Swelling of the legs

  • Blue legs or feet

Call 911

Call 911 if any of the following occur:

  • Rapid or difficulty breathing or blue lips

  • Chest pains

  • Passing out or loss of consciousness

  • Complains that their heart is beating fast

Online Medical Reviewer: Robyn Zercher FNP
Online Medical Reviewer: Scott Aydin MD
Online Medical Reviewer: Stacey Wojcik MBA BSN RN
Date Last Reviewed: 5/1/2025
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