Prognosis and duration of disabling effects

In young persons with no evidence of underlying cardiac disease and no known cause for the syncope the prognosis is good. Many people experience only a solitary episode although around 30% may experience a further episode within 2 years. Some may get attacks in predictable situations such as during periods of anxiety or when unwell with a viral infection but generally the condition is infrequent and unpredictable.

The prognosis of syncope resulting from another condition depends on the treatment and underlying prognosis of that condition.