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Is a heart murmur dangerous?

A heart murmur—an abnormal sound that is heard through the stethoscope—may exist without any associated medical conditions. These types of heart murmurs are known as functional murmurs and are common in highly trained athletes.

An abnormal heart murmur is caused by a heart valve defect that is present at birth or from heart valve disease that can arise from an infection, disease, or aging. (This answer provided for NATA by the University of Montana Athletic Training Education Program.)

Continue Learning about Heart Murmur

What causes a heart murmur?
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How is a heart murmur diagnosed?
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Can a child outgrow a normal heart murmur?
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.