Movement disorders : official journal of the Movement Disorder Society
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Many patients with Parkinson's disease (PD) have clinically significant anxiety, depression, fatigue, sleep disturbance, or sensory symptoms. The comorbidity of these nonmotor symptoms and their relationship to PD severity has not been extensively evaluated. Ninety- nine nondemented PD patients were evaluated with the following battery of tests: Beck Anxiety Inventory (BAI), Beck Depression Inventory (BDI), Fatigue Severity Scale (FSS), Pittsburgh Sleep Quality Index (PSQI), a sensory symptom questionnaire, Unified Parkinson's Disease Rating Scale (UPDRS), Hoehn & Yahr (H/Y) Stage, and the Schwab & England ADL scale (S/E). ⋯ This study reveals that the nonmotor symptoms of PD frequently occur together in the same patients. Increased comorbidity of the five nonmotor symptoms was associated with greater PD severity. These results suggest that recognition of these diverse nonmotor symptoms may be enhanced by looking for others when one nonmotor symptom has been identified.