What causes tinnitus?

[ODYO]

For the majority of cases, an underlying hearing loss is the source of tinnitus. Because of hearing loss, the brain receives less auditory stimulation (heard sounds) from the ear. To respond to this lack of external stimulation, the brain increases the volume of certain tones (example: high-pitched sound) to compensate for this lack of auditory stimulation. The brain thus translates this hyperactivity into a “ghost” sound, which is called tinnitus.

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