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Tinnitus |
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tinnitus [′tin·əd·əs]
(medicine) A ringing, roaring, or hissing sound in one or both ears. Tinnitus a noise in the ears, a sensation arising in the absence of external acoustic stimuli. Tinnitus can occur in one ear or both ears. Physiological tinnitus sometimes occurs under conditions of complete silence; it is due to the sensation of blood flowing in the small capillaries of the inner ear. In contrast, pathological tinnitus, usually accompanied by impairment of hearing, is caused by diseases of the middle or inner ear or auditory nerve, by intoxication with an industrial chemical (mercury, arsenic, phosphorus, lead), or by some drugs. Differences in the intensity and nature of the noise (buzzing, ringing, whistling) are diagnostic clues. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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