What Is a Heart Murmur?
A heart murmur is an extra or unusual sound heard during a heartbeat. Murmurs
range from very faint to very loud. They sometimes sound like a whooshing or swishing noise.
Normal heartbeats make a "lub-DUPP" or "lub-DUB" sound. This is the sound of the heart valves closing as blood moves through the heart. Doctors can hear these sounds and heart murmurs using a stethoscope.