Essential tremor does not exist in:
Essential tremor Most common of all movement disorder. Higher in frequency and lower in amplitude than the tremor of PD. May be a form of enhanced physiological tremor, but recent evidence suggests a cerebellar abnormality. Often familial. Postural and action tremor that tends to affect the hands, head, and voice. Made worse by anxiety.
Hand
Head
Lips
Voice
Parkinsonism and other movement disorders