Tinnitus, tih NY tuhs or TIHN ih tuhs, is the sensation of hearing sounds that seem to come from within the head. Most people with tinnitus hear ringing, buzzing, or hissing noises. Others hear sounds like a cricket's chirping or the ocean's roar. The noise may be continuous or may come and go. It may be heard in one or both ears. Tinnitus can be extremely distracting. In some cases, the noise sounds loud enough to keep the person awake.