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Parkinson's disease is a condition in which parts of the brain become progressively damaged over many years.

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Symptoms of Parkinson's disease

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The 3 main symptoms of Parkinson's disease are:

• involuntary shaking of particular parts of the body (tremor) 

• slow movement

• stiff and inflexible muscles

A person with Parkinson's disease can also experience a wide range of other physical and psychological symptoms.

These include:

• depression and anxiety

• balance problems (this may increase the chances of a fall)

• loss of sense of smell (anosmia)

• problems sleeping (insomnia)

• memory problems