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Definition
By Mayo Clinic staffA normal heartbeat makes two sounds like "lubb-dupp" (sometimes described as "lub-DUB"), which are the sounds of your heart valves closing. Heart murmurs are abnormal sounds during your heartbeat cycle — such as whooshing or swishing — made by turbulent blood in or near your heart.
Heart murmurs can be present at birth (congenital) or develop later in life. A heart murmur isn't a disease — but murmurs may indicate an underlying heart problem.
Most heart murmurs are harmless (innocent) and don't need treatment, but some heart murmurs may require follow-up tests to be sure the murmur isn't caused by a serious underlying heart condition. Treatment, if needed, is directed at the underlying cause of your heart murmurs.
