Abstract Cochlear implantation (CI) is a highly effective treatment for severe-to-profound hearing loss, but it can result in postoperative vestibular dysfunction, including vertigo and imbalance. This case report describes a 22-year-old female who developed severe vertigo and imbalance following right ear CI surgery. Audiological assessment confirmed normal hearing in the left ear and profound sensorineural hearing loss in the right ear. Vestibular tests revealed significant dysfunction, including left-beating spontaneous nystagmus, vestibular hypofunction, and abnormal saccular function in the implanted ear. This case underscores the prevalence of vestibular complications post-CI, reported in up to 75% of recipients. Comprehensive preoperative vestibular assessment is essential for identifying potential risks and guiding surgical decisions, such as choosing between unilateral and bilateral implantation. Early identification and management of vestibular issues can improve outcomes and quality of life for CI patients.
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