This book focuses on research on sensorineural hearing loss, syndromic or non-syndromic, related to genetic and viral factors. The metabolic syndrome, autoimmune etiopathogenesis, and new elements of cochlear implantation were also evaluated. New developments and utility of laboratory tests in inner ear diseases (sudden sensorineural hearing loss, Meniere disease, benign paroxysmal positional vertigo, vestibular neuritis) are also discussed.