Tinnitus

Tinnitus is a phenomenon of the nervous systemconnected to the ear, characterised by perception of a ringingor beatingsound (often perceived as sinusoidal) with no external source. This sound may be a quiet background noise, or loud enough to drown out all outside sounds. It is sometimes refered to as "the club disease" as many people get temporary tinnitus at loud clubs or concerts.

Tinnitus can be objective (the sound, e.g., a bruit, can be perceived by a clinician) or subjective (perceived only by the patient).

Causes

Causes of tinnitus include:

• A sudden loud noise, prolonged exposure to loud musicthrough PA systemsor personal stereos, exposure to an excessively noisy work environment without ear protection, (eg industrial)
• Hearing loss(20 per cent of cases: chronic noise damage and presbycusis)
• Head injury(especially basal skull fracture)
• Drugs: aspirinoverdose, loop diuretics, aminoglycosides, quinine
• Temporomandibularand cervical spine disorders
• Suppurativeotitis media(also chronic infection and serous OM)
• Otosclerosis
• Ear wax
• Meniere's disease
• Impacted wisdom teeth
• Hypertensionand atherosclerosis
• Acoustic neuroma
• Palatal myoclonus(objectively detectable)
• Arteriovenous fistulaeand arterial bruits(objectively detectable)
• Severe anemiaand renal failure
• Glomus jugulare tumours(objectively detectable)
• Lyme Disease
• Stressand depression
• Thyroid disorders, such as hyperthyroidismor hypothyroidism

Treatment

Some types of tinnitus can be treated while others are permanent. In general, there are no cures specific to tinnitus, but if it is caused by a physical condition that can be treated, the tinnitus may also resolve. Chronic tinnitus can be quite stressful psychologically as it distracts the affected individual from mental tasks and interferes with sleep, particularly when there is no external sound. The affected individual may have to generate artificial noisethat masks the tinnitus sound. A combination of external masking and psychological counseling known as tinnitus retraining therapyis widely practiced. While it does not actually cure the tinnitus, many report that it becomes much less disturbing and easier to ignore.

Mechanisms of subjective tinnitus

The mechanisms of subjective tinnitus are often obscure. While it's not surprising that direct trauma to the inner ear can cause tinnitus, other apparent causes (e.g., TMJand dental disorders) are difficult to explain. Recent research has proposed that there are two distinct categories of subjective tinnitus, otic tinnitus caused by disorders of the inner ear or the acoustic nerve, and somatic tinnitus caused by disorders outside the ear and nerve, but still within the head or neck. It is further hypothesised that somatic tinnitus may be due to "central crosstalk" within the brain, as certain head and neck nerves enter the brain near regions known to be involved in hearing.

Prevention

Since there is no 'cure' for tinnitus, only treatment, it is wise to take precautions to prevent it occurring. If you hear a ringing in your ears after exposure to a loud environment such as a concert or work place, it means damage is being done. If it is not possible to limit your exposure, consider wearing earplugs or ear defenders - a legal requirement for workplace environments over 85db in England. For musicians and DJs, special musicians' earplugs can lower the volume of the music without distorting the sound and can prevent tinnitus developing in later years.

External links

• British Tinnitus Association
• Famous people with tinnitus
• Tinnitus Support Message Board
• Tinnitus Research
• Somatic Craniocervical Tinnitus and the Dorsal Cochlear Nucleus Hypothesis
• Useful information about tinnitus from RNID
• American Tinnitus Association.da:Tinnitus

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This article is licensed under the GNU Free Documentation License.
It uses material from the http://en.wikipedia.org/wiki/Tinnitus Wikipedia article Tinnitus.