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February 3, 2012
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Tinnitus

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Tinnitus Overview

Tinnitus, (pronounced tih-NIGHT-us or TIN-ih-tus) is a ringing, swishing, or other type of noise that seems to originate in the ear or head. Most of us will experience tinnitus or sounds in the ears at some time or another. According to the National Institute on Deafness and Other Communication Disorders (NIDCD), almost 12 percent of men who are 65 to 74 years of age are affected by tinnitus. Tinnitus is identified more frequently in white individuals, and the prevalence of tinnitus in the U.S. is almost twice as frequent in the South as in the Northeast.

Tinnitus can be extremely disturbing to people who have it. In many cases it is not a serious problem, but rather a nuisance that may go away. However, some people with tinnitus may require medical or surgical treatment. Twelve million Americans have tinnitus, and one million experience it so severely it interferes with their daily activities.

Tinnitus can arise in any of the four sections of the hearing system: the outer ear, the middle ear, the inner ear, and the brain. Some tinnitus or "head noise" is normal. A number of techniques and treatments may be of help, depending on the cause.

  • Some of the most common include a sound of crickets or roaring, buzzing, hissing, whistling, and high-pitched ringing.

  • Other types of tinnitus include a clicking or pulsatile tinnitus (the noise accompanies your heartbeat).

  • The most common type of tinnitus is known as subjective tinnitus, meaning that you hear a sound but it cannot be heard by others.

  • A much more uncommon sort is called objective tinnitus, meaning your doctor may sometimes actually hear a sound when he or she is carefully listening for it.

Picture of the structures of the outer, middle, and inner ear

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Hearing Loss Overview

To understand hearing loss it is important to understand how normal hearing takes place. There are 2 different pathways by which sound waves produce the sensation of hearing: air conduction and bone conduction.

  • In air conduction, sound waves move through the air in the external auditory canal (the "ear canal" between the outside air and your eardrum). The sound waves hit the tympanic membrane (eardrum) and cause the tympanic membrane to move.
  • The bones in the middle ear are connected to the tympanic membrane. When the tympanic membrane moves, this movement is transmitted to the bones. These 3 bones are called the malleus, the incus, and the stapes. Movement of the stapes causes pressure waves in the fluid-filled inner ear.
  • The cochlea is an inner ear structure surrounded by fluid. It contains multiple small hairs. Pressure waves in the fluid cause the hairs to m...

Read the Hearing Loss article »


Read What Your Physician is Reading on Medscape

Inner Ear, Tinnitus »

Tinnitus is the perception of sound in the head or the ears.

Read More on Medscape Reference »

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