Heart murmurs are abnormal sounds that can be heard during a cardiac examination. In general, murmurs are thought to arise due to the turbulent flow of blood across heart valves. There are many different types of murmurs - most are benign, but several can be associated with significant heart disease. Some symptoms of valvular heart disease can include chest pain, shortness of breath, palpitations, and fainting. While there are benign causes of fainting (i.e. dehydration, vasovagal), the combination of a murmur with fainting should prompt at least an initial medical evaluation by a professional. Please note that JB s answer is incorrect.