Parkinsonism refers to any condition that causes symptoms similar to Parkinson's disease, like tremors, rigid muscles, slow movement, and changes in walking. Other conditions that can lead to parkinsonism include:
Medications such as reserpine, Thorazine
Toxic exposures to carbon monoxide, cyanide
Hypothyroidism
Hypoparathyroidism
Wilson's disease (a genetic condition that leads to build up of copper in the brain)
Progressive supranuclear palsy