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Observations concerning the characteristics of patients who presented to a medical clinic with a principal complaint of chronic medically unexplained fatigue (Chronic Fatigue Syndrome or CFS) are described, including the cognitions (thoughts and assumptions) elicited from a sample of these patients who were treated using cognitive behavioural therapy. On the basis of these observations a cognitive theory of the aetiology of CFS is proposed. These observations have implications for the treatment of patients with CFS.

Original publication




Journal article


Behav Res Ther

Publication Date





535 - 544


Adaptation, Psychological, Adult, Affective Symptoms, Cognitive Behavioral Therapy, Fatigue Syndrome, Chronic, Female, Humans, Internal-External Control, Sick Role, Stress, Psychological