Objective:To compare the clinical features and outcomes between patients with multi-canal benign paroxysmal positional vertigo(BPPV)and single-canal BPPV.Method:Five-hundred and seventy-eight patients with BPPV were retrospectively analyzed and divided into three groups:single-canal BPPV(526cases),multi-canal BPPV in unilateral ear(11cases)and multi-canal BPPV in both ears(41cases).All patients were diagnosed by using the Dix-Hallpike test or roll test and treated with the canalith repositioning procedure.T...