Sudden hearing loss is defined classically as sensorineural hearing loss developing within less than three days which emerges with hearing loss at all three successive frequencies at more than 30 dB. We analyzed 14 patients with sudden hearing loss with known etiologies whom we hospitalized, and treated in our clinics between January 2005 and January 2007. We reviewed etiological factors in patients, and aimed to present grades, characteristics, and treatment responses of hearing loss.