Movement disorders : official journal of the Movement Disorder Society
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To compare the prevalence of fatigue in patients with Parkinson's disease (PD) with that in healthy elderly people and to explore the suggestion that fatigue is an independent symptom of PD. ⋯ Fatigue is a common symptom in PD. Although fatigue correlated with depressive symptoms, patients with PD who did not have depression, dementia, or sleep disturbances also reported a high prevalence of this symptom. This supports the hypothesis that fatigue is an independent symptom of PD overlapping with, but not causally related to, the concurrence of depressive symptoms.