What are the three motor signs of Parkinson disease (PD)?

Updated: Aug 29, 2019
  • Author: Robert A Hauser, MD, MBA; Chief Editor: Selim R Benbadis, MD  more...
  • Print
Answer

The classic motor features of Parkinson disease typically start insidiously and emerge slowly over weeks or months, with tremor being the most common initial symptom. The 3 cardinal signs of Parkinson disease are resting tremor, rigidity, and bradykinesia. Postural instability (balance impairment) is sometimes listed as the fourth cardinal feature. However, balance impairment in Parkinson disease is a late phenomenon, and in fact, prominent balance impairment in the first few years suggests that Parkinson disease is not the correct diagnosis. (See Presentation.)


Did this answer your question?
Additional feedback? (Optional)
Thank you for your feedback!