Parkinson's disease

Parkinson's disease or Parkinson's syndrome is a progressive neurological disease linked to reduced levels of dopamine.https://www.merriam-webster.com/dictionary/Parkinson%27s%20disease https://www.msdmanuals.com/home/brain,-spinal-cord,-and-nerve-disorders/movement-disorders/parkinson-disease-pd

Parkinsonism
Parkinsonism is when the symptoms of Parkinson's disease are caused by another brain disease, a brain injury or head injury, drugs or toxins.https://www.msdmanuals.com/home/brain,-spinal-cord,-and-nerve-disorders/movement-disorders/parkinsonism

Parkinsonism can be caused by West Nile virus encephalitis or other forms of viral encephalitis, and a rare "brain inflammation" after a flu-like infection.

Symptoms
Main symptoms of Parkinson's disease are a tremor experienced when resting muscles, muscle rigidity (stiffness), slower and uncoordinated voluntary movements, and difficulties with balance.

Learn more

 * Parkinson's disease - Merck Manuals
 * Parkinsonism - Merck Manuals