Tinnitus · mostly not the ear ringing

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Hearing & the Cochlea
Reduced input from one frequency band of the cochlea is one of the most common triggers of tinnitus: the gap arises in the ear, while the sound itself is kept going by the brain. That is why hearing loss and tinnitus so often come together, even though the ringing is not in the ear.
Nervous
When the signal from one frequency band of the cochlea thins out, auditory structures closer to the brain become more active rather than less (central gain enhancement): in animal studies, inhibitory signaling weakens, neurons become more excitable, and spontaneous firing increases. Tinnitus mostly arises along this pathway rather than from the ear itself ringing.

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Where the ringing comes from

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Tinnitus sounds like the ear ringing, but the sound is mostly not produced by the ear. Research places it more along the auditory pathway that runs up from the cochlea — the cochlear nucleus in the brainstem, the inferior colliculus in the midbrain, and on up to the auditory cortex. What happens on the ear side is often just less input: one stretch of the cochlea (the coiled tube in the inner ear that turns sound into nerve signals) starts sending up a thinner signal.

What follows happens centrally, in three steps. Input in one frequency band drops; the central pathway turns up the gain (how strongly the signal is amplified) for that band; and the nerves' background noise, normally inaudible, gets amplified along with it and is heard as sound. These central changes were recorded mainly in animals, and the review literature itself still calls the step from higher gain to tinnitus as a result a hypothesis. For how the cochlea lays frequency out as position, see Hearing & the Cochlea.

For you, this means remedies that pour something into the ear, or promise a supplement that opens up the blood vessels in the ear, miss the target on mechanism alone. And remember one thing: if one ear suddenly muffles while ringing starts, do not wait at home — get your hearing checked by a doctor soon.

Watch this step as a mechanism animationOpen mechanism

Educational content, not medical advice — consult a clinician.

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