Many people experience an occasional ringing (or roaring, hissing, buzzing, or tinkling) in their ears. The sound usually lasts only a few minutes. Ringing in the ears that does not get better or go away is called tinnitus.

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Note added at 19 mins (2009-10-15 16:19:42 GMT)
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Also:

http://www.netten.ro/Clear-Tinnitus-by-Clear-Products-tratam...

Diagnosticul de Tinnitus (acufene)
Medicul ORL-ist va face un istoric complet al modului în care au debutat acufenele şi acesta va include şi procedurile pentru testarea auzului şi alte deficienţe.
http://www.acufene.ro/cumsa.html