Tinnitus is sound you hear that has no outside source — ringing, buzzing, hissing, a cricket, a hum. It is not a disease; it's a symptom. And the surprising modern insight is that it's usually generated by the brain, not the ears — which changes everything about how you treat it.
Most tinnitus is a phantom auditory perception — a ringing, buzzing, hissing, roaring, or clicking with no acoustic source in the room. It's usually high-pitched, can be constant or come and go, and often sits in one or both ears or 'in the head.' It is extremely common: roughly 10–15% of adults experience it, and about 1–2% find it severely distressing. Evidence ●●●●●
The key shift in understanding: tinnitus usually begins with some loss of input from the ear (often a subtle hearing loss), and the brain compensates by turning up its own internal volume — central gain, a form of maladaptive neuroplasticity, with hyperactivity in the auditory cortex and thalamocortical circuits. That's why the ear can look 'normal' on basic tests, and why cutting the auditory nerve rarely silences it: by then the sound is being generated centrally. Evidence ●●●●○
Tinnitus is common, and for the great majority it does not mean you are going deaf, that your brain is damaged, or that something sinister is happening. Most new tinnitus — especially after loud noise — settles or fades in salience over weeks to months. There are a few specific patterns that do warrant prompt assessment (one-sided, pulsating, sudden, or with hearing loss or dizziness), covered later — but the default frame should be calm, not catastrophic.
How to read the evidence dots
Throughout this guide, ●●●●● means strong, replicated evidence and ○○○○○ means essentially unproven. Tinnitus attracts a lot of hype and false cures, so the grades carry weight: they separate what genuinely helps from what merely sells.
The Tinnitus Guide