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Parkinson's disease

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Parkinson's disease (PD) is a brain disorder in which when certain nerve cells (neurons) in a part of the brain called the substantia nigra die or become impaired.[1] The impairment of these cells causes a decrease in dopamine which allows for smooth, coordinated function of the body's muscles and movement. When around 80% of these cells die, Parkinson's disease becomes evident.


  • Tremor (shaking)
  • Slowness of movement
  • Rigidity (stiffness)
  • Difficulty with balance
  • Small, cramped handwriting
  • Stiff facial expression
  • Shuffling walk
  • Muffled speech
  • Depression

See Also


  1. "About Parkinson Disease." National Parkinson Disease Foundation. n.d. Accessed on July 29, 2008.