Syncope is a transient loss of consciousness, described as fainting or passing out. It usually relates to a temporary insufficient flow of blood to the brain. Syncope is a common condition, which can occur at any age and in people without other medical problems.
Syncope can result from a sudden drop in blood pressure or heart rate, or changes in the amount of blood in areas of your body (such as from a violent coughing fit).
Syncope can have cardiovascular, neurological, or psychiatric causes. However, the most common cause is an overreaction of the body to certain triggers, such as the sight of blood or extreme emotional distress. It can also be caused by overheating, dehydration, heavy sweating, or exhaustion.
Syncope may suggest a serious disorder if: