A heart murmur is a sound made by turbulent blood flow in the heart. It sounds like whooshing or swishing with each heartbeat. Some adults and many children have incidental heart murmurs that are harmless and are not caused by abnormalities in the heart. However, some heart murmurs can signal an underlying heart problem.
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Benign murmurs are caused by the normal flow of blood through the heart and large vessels near the heart. The murmur may come and go over time. Some things that can increase blood flow and cause a benign heart murmur to be heard include:
Abnormal heart murmurs can be due to:
Normal heart murmurs are more common in children 3-7 years old. Pregnant women are also at increased risk.
Risk factors for abnormal heart murmurs include:
Benign heart murmurs usually do not cause symptoms. People with mitral valve prolapse sometimes complain of vague chest discomfort and other symptoms. It remains unclear whether or not the valvular abnormality is causing the symptoms.
Signs and symptoms of abnormal heart murmurs are associated with:
If you think that you or your child has a heart murmur, call the doctor for an evaluation.
Most benign heart murmurs are diagnosed during the course of a routine physical exam with a stethoscope. Some abnormal heart murmurs are also discovered this way. Other abnormal heart murmurs are discovered initially by their symptoms.
Your bodily fluids may be tested. This can be done with blood tests.
Images may be taken of your heart. This can be done with:
Your heart's electrical activity may be tested. This can be done with an ECG.
Benign heart murmurs do not require treatment. Treatment of other heart murmurs depends on the underlying cause and extent of the problem.
Medications can either treat the cause of the heart abnormality associated with the murmur or help compensate for its dysfunction:
Surgery is often necessary to treat severe heart abnormalities:
Preventing benign heart murmurs is unnecessary. To help reduce your risk of developing an abnormal heart murmur:
Although not routinely recommended for every type of heart murmur, you may need to take antibiotics before and after some medical or dental procedures that could allow bacteria to enter your bloodstream. Ask your doctor if you need to take preventive antibiotics.
American Heart Association
National Heart, Lung, and Blood Institute
Canadian Cardiovascular Society
The College of Family Physicians of Canada
Antibiotic prophylaxis. American Dental Association website. Available at: http://www.ada.org/en/member-center/oral-health-topics/antibiotic-prophylaxis. Update September 14, 2017. Accessed September 29, 2017.
Heart murmurs. American Heart Association website. Available at: http://www.heart.org/HEARTORG/Conditions/More/CardiovascularConditionsofChildhood/Heart-Murmurs_UCM_314208_Article.jsp#.Wc5_b1tSxxA.Updated February 17, 2016. Accessed September 29, 2017.
Heart murmur in children. EBSCO DynaMed Plus website. Available at:http://www.dynamed.com/topics/dmp~AN~T115809/Heart-murmur-in-children. Updated December 18, 2015. Accessed September 28, 2016.
Heart murmurs and your child. Kids Health—Nemours Foundation website. Available at: http://kidshealth.org/en/parents/murmurs.html. Updated January 2017. Accessed September 29, 2017.
Last reviewed September 2018 by EBSCO Medical Review Board Marcin Chwistek, MD Last Updated: 9/30/2013