Type of tremor	Frequency	Occurrence	Etiology	Treatment*
Postural tremor	5 to 9 Hz	When limb is positioned against gravity	Physiologic tremor, essential tremor, alcohol or drug withdrawal, metabolic disturbances, drug-induced tremor, psychogenic tremor	Beta blockers, primidone (Mysoline), acetazolamide (Diamox), clonazepam (Klonopin), botulinum toxin, brain gabapentin (Neurontin), deep stimulation, thalamotomy
Rest tremor	3 to 6 Hz	When limb is fully supported against gravity and the muscles are not voluntarily activated	Parkinson's disease, multiple-systems atrophy, progressive supranuclear palsy, drug-induced tremor, rubral tremor, psychogenic tremor	Levodopa–carbidopa (Sinemet), anticholinergics and other antiparkinsonian agents, deep brain stimulation, pallidotomy, thalamotomy
Action tremor†	3 to 10 Hz	During any type of movement	Cerebellar lesions, rubral tremor, psychogenic tremor	Wrist weights, isoniazid