Dear madam, Thanks for your health concerns over your daughter. As a matter of fact, innocent flow murmurs are extremely common in childhood and most don t have a clinical significance; however, if there are symptoms that potentially could be cardiac in origin, further investigations are needed. A complete physical, basic blood tests and EKG sound like a good start, and depending on those a heart ultrasound or echocardiogram might or not be warranted. Cardiac causes of dizziness include arrhythmias, heart failure, congenital heart disease and valvular problems amongst others. There are a host of other non-cardiac causes of dizziness, many of them actually related to the nervous system. Hope this is useful, wish you and your daughter the best health, Dr Brenes Salazar MD Cardiovascular Diseases Mayo Clinic MN