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Ataxia
Bradykinesia
Choreoathetosis
Corticobasal Degeneration
Dyskinesias (Paroxysmal)
Dystonia
Essential Tremor
Hereditary Spastic Paraplegia
Huntington's Disease
Multiple System Atrophy
Myoclonus
Parkinson's Disease
Progressive Supranuclear Palsy
Restless Legs Syndrome
Rett Syndrome
Spasticity
Sydenham's Chorea
Tardive Dyskinesia
Tics
Tourette's Syndrome
Tremor
Wilson Disease
 

Associated Findings

In 1994, the Essential Tremor Study Group reported on the relationship of ET to other movement disorders in 678 patients with ET. Several conditions have been reported in association with essential tremor including Parkinson's disease (6.1%), coexisting dystonia (6.9%), and myoclonus (1.8%). The Study Group concluded that the frequency of Parkinson's disease in individuals with ET is greater than would be reported in the general population and that other movement disorders are infrequently observed in association with essential tremor. Other reports have indicated a higher percentage of coexisting dystonia (47%) and ET since postural tremor associated with dystonia may resemble that seen in ET. There are also reports of an association between ET and migraine headaches. One study suggested that the prevalence of migraine in individuals with ET is greater than in the general population. The correlation may be as high as 26%.