Differential diagnosis of tremor.

The differential diagnosis of tremor is based on the clinical distinction of rest, postural and intention tremor and the presence of additional clinical signs and data from the medical history. The most common pathological tremors are essential tremor and the tremors of Parkinson's disease. Among the patients with essential tremor those with intention tremor are often misdiagnosed as cerebellar tremors. Patients with monosymptomatic resting tremors represent a special subgroup of Parkinson's disease. Primary orthostatic tremor and dystonic tremor are rare clinical syndromes which have recently been well defined. Holmes' tremors are defined by their low frequency and the occurrence of resting and intention tremor. Palatal tremor can be separated into two subgroups. Psychogenic tremor can be diagnosed on the basis of clinical criteria. The gold standard of tremor differential diagnosis is still based on clinical criteria.