Tinnitus sounds like the ear ringing, but treating it as a tiny speaker lodged in your ear gets the location wrong at step one. The evidence points the source further up — along the auditory pathway running from the cochlea inward : the cochlear nucleus in the brainstem, the inferior colliculus in the midbrain, all the way to the auditory areas of the cortex. What happens out at the ear is often just this: less input arriving .frequency is laid out as position inside the cochlea : whichever stretch moves most tells you which band of frequency came in. That place-to-frequency map is laid down by the gradient in the membrane's width and stiffness — but only in rough form. What actually sharpens the tuning is active amplification by the outer hair cells; passive mechanics alone cannot account for tuning this sharp at the periphery.rarely the whole ear declining together . Certain stretches go first. The classic shape of early or moderately advanced noise-induced hearing loss is a notch sitting between 3 and 6 kHz, usually centred near 4 kHz, with some recovery by 8 kHz. It counts as typical , and describes the early stage only — not as a notch means noise damage . The more accurate description: one stretch of the cochlea is now sending up a thinner signal, while its neighbours on either side carry on as usual.central , and the direction is counterintuitive. A review summarises the evidence this way: after cochlear output drops, activity in more central auditory structures is paradoxically enhanced at suprathreshold intensities — a phenomenon called central gain enhancement. Animal experiments show the individual parts moving: markers of inhibitory transmission (glycinergic and GABAergic) decline persistently, neurons' intrinsic excitability goes up (for example, reduced Kv7 potassium conductance in dorsal cochlear nucleus neurons), and spontaneous firing in the central auditory system increases.turns up the gain knob on that band — the signal comes back a little, and the noise floor you were never meant to hear gets amplified along with it . This is the most-discussed explanatory route to the persistent tone. Three boundaries have to be stated alongside it. First, those electrical recordings were made directly in animals ; this cannot be written as 'your brain is doing this right now'. Second, this is not a uniform whole-brain turn-up — the magnitude differs at each level of the pathway, so do the time courses, and multiple mechanisms are likely contributing at once. Third, the jump from gain being raised to therefore tinnitus is a step the review itself labels a hypothesis , not established causation.cutting the auditory nerve should end it. The literature notes that surgically sectioning the auditory nerve does not eliminate tinnitus in every case , and that this is precisely what favours a central rather than peripheral origin. Note the wording — it fails to eliminate it consistently , which is not the same as cannot eliminate it . The first says the periphery isn't the whole answer; the second would be a claim the evidence can't carry.complex interaction between peripheral and central mechanisms within the auditory pathway. So not the ear ringing does not mean nothing to do with the ear . The gap in that stretch of cochlea is often the trigger; the perception of sound is maintained centrally.pouring something into the ear is aimed at the wrong target by construction; the interventions current evidence can support act on how the brain processes and relates to that sound . The only one that has ever reached moderate certainty is cognitive behavioural therapy — it may reduce the negative impact tinnitus has on quality of life, but the certainty runs only low to moderate, and what it changes is the distress , not the sound switching off. The pages that follow open up that effect size, and explain why the supplement route doesn't lead anywhere.