Tinnitus is the term used for noises or sounds which are heard in one or both ears or in the head which do not come from an external source. They are often described as a high-pitched ringing but can also be described as a buzzing, hissing,
pulsing, whistling,
roaring, or various other sounds. Tinnitus can be very mild in loudness and only noticeable in a quiet room or it can become extremely loud and annoying to the point where the sufferer hears nothing else. It can be present all of the time or occur intermittently.