[Dutch language area definition of chronic fatigue].

Chronic fatigue is a frequent but unspecific characteristic of many diseases. However, a clear definition of 'chronic fatigue' is still lacking. The Flemish-Dutch Research Group - Chronic Fatigue (VNO-CHROVER) has taken the opportunity to formulate such a definition that can be widely applied. This definition is not only beneficial to researchers conducting, reporting and comparing scientific studies on chronic fatigue in diverse patient populations, but also to clinicians of various disciplines in order to improve patient care. VNO-CHROVER proposes to define chronic fatigue as 'a self-reported reduction of physical and/or mental well-being that persists longer than 6 months and is manifested as exhaustion by which one fails to function at the desired level.'