Of 300 patients, 208 were considered to have idiopathic SSNHL; 50% were treated with corticosteroids, 44% did not receive any treatment. The treated patients had the same outcome as the non-treated patients. The time interval from onset of SSNHL to start of treatment was of importance for the outcome irrespective of type of audiogram or results from laboratory tests. Higher age and heredity for hearing loss gave a significantly lower chance of improvement.