Syncope is a common condition. It affects 3% of men and 3.5% of women at some point in life. Syncope is more common as you get older and affects up to 6% of people over age 75. The condition can occur at any age and happens in people with and without other medical problems.
Still, syncope is always a potentially serious issue, both because it may indicate a serious underlying problem, and because any loss of consciousness can produce injury.
So, if you have an episode of syncope, you should be evaluated by your doctor to determine its cause.