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Patients suffering from Parkinson's disease (PD) will typically experience a range of motor and nonmotor symptoms during the course of their illness, each of which will affect a particular individual to varying degrees. However, patients' perceptions of troublesome symptoms often differ from the clinician's view, and these discrepancies can hamper effective management of PD. In this study, we have assessed 265 consecutive PD patients by asking them to rank their three most troublesome symptoms in the last 6 months, so to gain further insight from the impact of illness on patients' quality of life. Patients were divided into early (<6 years) and late PD groups (≥6 years) from symptom onset. The division at 6 years was based on the mean time from symptom onset to the development of motor complications. In the early PD group, the 5 most prevalent complaints (ranked in descending order) are slowness, tremor …