A heart murmur is a blowing, whooshing, or rasping sound that is heard during a heartbeat.
The sound with a heart murmur is caused by turbulent (rough) blood flow through the heart valves or near the heart.
Some heart murmurs are harmless (innocent).
An innocent heart murmur is not a sign of heart disease and doesn't need treatment.
Other heart murmurs may be a sign of a serious heart condition.
Tests are needed to check the heart and heart valves.