Essential Tremor Essential Tremor Essential tremor is the most common movement disorder. It may alternatively involve the tongue or voice, presentation that is less likely to be noticed.
Essential tremor affects anywhere from one to five million people in the United States.
Cause The specific cause of essential tremor is unknown. It worsened by stress or anxiety. It has a strong familial component. As the name suggests, essential tremor causes a rhythmic uncontrollable shaking of a part of the body. The tremor may be a rest tremor, one that is present at rest or an intention tremor, one that occurs when the affected limb is used.