Have you or a family member been diagnosed with a heart murmur? A heart murmur is an extra or unusual sound heard during a heartbeat.Innocent heart murmurs happen in normal hearts and usually do not cause symptoms. Innocent murmurs are found in healthy children, pregnant women or can develop because of a condition. When the condition is treated, the murmur goes away.Abnormal heart murmurs can cause symptoms such as poor growth in children, shortness of breath, sweating, chest pain, dizziness, fainting and fatigue. They can be caused by congenital heart defects, infections or other conditions that damage the heart.If you have an abnormal heart murmur, your doctor will refer you to a specialist who can determine whether medicine or surgery will improve your heart function.