Tinnitus is the perception of sound when there is no external sound present. These subjectively perceived sounds can be reported as a ringing, a buzzing, a hissing or a roaring noise. Tinnitus is not itself a disease, but a symptom of an underlying condition. It is recommended that the patients should seek medical attention if they feel their tinnitus is bothering them. In most cases, tinnitus is not a sign of anything serious.