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.
Parkinsonism and other movement disorders
Hand
Head
Lips
Voice
Lips