Essential tremor is considered the most common neurologic movement disorder, that is 20 times more prevalent than Parkinson's disease.
Essential tremor is a chronic condition characterized by involuntary, rhythmic tremor of a body part, most typically the hands and arms.
Essential tremor is considered a slowly progressive disorder and, in some people, may eventually involve the head, voice, tongue (with associated dysarthria), legs, and trunk.
However, in many people, the disorder may be relatively non-progressive. The tremor may be mild throughout life.