A heart murmur is an extra or unusual sound heard during a heartbeat. Murmurs range from very faint to very loud. Sometimes they 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. Overview The two types of heart murmurs are innocent (harmless) and abnormal. Innocent heart murmurs arent caused by heart problems. These murmurs are common in healthy children. Many children will have heart murmurs heard by their doctors at some point in their lives. People who have abnormal heart murmurs may have signs or symptoms of heart problems. Most abnormal murmurs in children are caused by congenital (kon-JEN-ih-tal) heart defects. These defects are problems with the hearts structure that are present at birth. In adults, abnormal heart murmurs most often are caused by acquired heart valve disease. This is heart valve disease that develops as the result of another condition. Infections, diseases, and aging can cause heart valve disease. Outlook A heart murmur isnt a disease, and most murmurs are harmless. Innocent murmurs dont cause symptoms. Having one doesnt require you to limit your physical activity or do anything else special. Although you may have an innocent murmur throughout your life, you wont need treatment for it. The outlook and treatment for abnormal heart murmurs depend on the type and severity of the heart problem causing them. 
What is (are) Heart Murmur ?