Heart murmurs are not technically illnesses or disease processes. They are sounds that the doctor can hear through their stethoscope that accompany the normal sounds made by the heart. The sound is often described as a whooshing or swishing noise. Heart murmurs can be benign, and many healthy people have them. They are very common in babies and young children.
Information. The normal sounds the heart makes happen when the ventricles contract, and their valves snap shut. The murmurs seem to be caused by turbulence in the flow of blood in and out of the heart. There are two basic type of heart murmur. One is functional, which is caused by something outside of the heart. Pathologic murmurs happen because there is something wrong with the heart, such as narrow or leaking heart valves. The functional murmurs are considered benign, or innocent.