Innocent (harmless) murmurs
A person with an innocent murmur has a normal heart and usually has no other signs or symptoms of a heart problem. Innocent murmurs are common in healthy children.
Abnormal murmurs
A person with an abnormal murmur usually has other signs or symptoms of a heart problem. Most abnormal murmurs in children are due to congenital heart defects—heart defects present at birth. In adults, abnormal murmurs are most often due to heart valve problems caused by infection, disease, or