Parkinsonism is a clinical syndrome characterized by tremor, bradykinesia (slowed movements), rigidity, and postural instability. Both hypokinetic features (bradykinesia and akinesia) and hyperkinetic features (cogwheel rigidity and tremors at rest) are displayed in parkinsonism. These are the four motor signs that are found in Parkinson's disease (PD) – after which Parkinsonism is named – and in dementia with Lewy bodies (DLB), Parkinson's disease dementia (PDD), and many other conditions. This set of signs occurs in a wide range of conditions and may have many causes, including neurodegenerative conditions, drugs, toxins, metabolic diseases, and neurological conditions other than Parkinson's disease. Source: Wikipedia (en)