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Background and ObjectivesZZThe evaluation of vestibular function is very important for patients with sudden sensorineural hearing loss (SNHL) as it is a well-known prognostic fac-tor. The purpose of this study was to evaluate subclinical vestibular dysfunction (SVD) and its association with prognosis in sudden SNHL patients with and without dizziness using the ves-tibular function tests. Subjects and MethodZZSeventy eight patients who had been diagnosed with unilateral sud-den SNHL were examined by dividing them into three groups according to their clinical find-ings such as vestibular function and subjective symptoms: 1) normal, 2) SVD and 3) dizziness. Vestibular dysfunction and hearing recovery rates were also assessed. ResultsZZPatients with SVD accounted for 62.5 % of patients even though they did not com-plain subjective dizziness. The extent of vestibular dysfunction in the dizziness group was great-er than that in the SVD group (p=0.05). The hearing recovery rates for normal, SVD and diz-ziness group were 72 % (13/18), 57 % (17/30) and 48 % (12/25), respectively. The incidence an