This information is useful for children, adults, and older adults
An older man who has syncope looks worried.

Some people faint from the sight of blood. Others may faint because they’re dehydrated. In other cases, serious heart conditions may cause an abnormal rhythm, preventing the heart from sending sufficient blood and oxygen to the brain and leading to a loss of consciousness. 

While some fainting is not a cause for concern, it’s critical to identify the cause and to treat any serious underlying conditions. In some cases, fainting can be caused by problems with the heart’s valves or arteries.

 At Yale Medicine, our doctors use the latest technology to diagnose and treat this condition.