Endocarditis—infection of the inner lining of heart valves and chambers
Rheumatic fever—inflammation and damage of the heart valves from poorly treated strep throat
Cardiac myxoma—a benign soft tumor within the heart (rare)
Normal heart murmurs are more common in children 3 to 7 years old. Pregnant women are also at increased risk.
The risk for abnormal heart murmurs increases with any of the conditions listed above.
Harmless heart murmurs usually do not cause symptoms. Signs and symptoms of abnormal heart murmurs may be:
Rapid breathing or trouble breathing
Blue lips (cyanosis)
Lightheadedness and/or fainting
Rapid or irregular heartbeat
Inability to gain weight in children
Enlarged neck veins
When Should I Call My Doctor?
Call the doctor if you think that you or your child has a heart murmur.
Most heart murmurs are found during a routine exam. The murmur can be heard with a stethoscope. More tests will be done for murmurs that are causing problems. Blood tests may be done to rule out other problems. Images may be taken of your heart. This can be done with:
The heart's electrical activity may also be tested. This can be done with an
Harmless heart murmurs do not need treatment.
Treatment will be based on the cause. Treating the cause may decrease or stop the murmur.
Antibiotics may need to be taken before and after some medical or dental procedures. It may be needed if the procedure could allow bacteria to enter your bloodstream. This is no longer a routine step for all heart murmurs.
A healthy heart may reduce the risk of some abnormal heart murmurs. Steps may include:
Antibiotic prophylaxis. American Dental Association website. Available at: http://www.ada.org/en/member-center/oral-health-topics/antibiotic-prophylaxis. Update August 5, 2019. Accessed February 10, 2020.
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 February 10, 2020.
Heart murmurs and your child. Kids Health—Nemours Foundation website. Available at: http://kidshealth.org/en/parents/murmurs.html. Updated January 2017. Accessed February 10, 2020.
Last reviewed September 2019 by
EBSCO Medical Review Board
Marcin Chwistek, MD
Last Updated: 8/26/2020
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