Can you die from heart murmer?

In most cases, a heart murmur is not life-threatening and does not require treatment. Murmurs that are caused by a heart defect present at birth (congenital heart defects) are usually not serious and do not cause symptoms. However, some heart murmurs can be a sign of a serious heart condition, such as a valve problem or infection of the heart muscle (endocarditis). These conditions can be life-threatening if they are not treated promptly. If you have a heart murmur, your doctor will recommend tests to determine if you have a heart condition that needs treatment.