There is still a considerable lack of knowledge about the etiology and treatment of sudden hearing loss, despite renewed interest among investigators. There is still no treatment regimen that has been demonstrated to be effective. Other clinics should be established to elucidate the factors surrounding the etiology and to as with sudden hearing loss have another diagnosable disorder, but careful follow-up is necessary. In our series this figure was approximately one-third. Luetic labyrinthitis, perilymphatic fistula, fluctuant hearing loss or endolymphatic hydrops, and acoustic neuroma are among the diagnoses to be considered.