Sudden hearing loss: symptoms, treatment, and when to worry
Last updated September 3, 2026.
Sudden sensorineural hearing loss is a rapid drop in hearing, usually in one ear, developing over hours to a couple of days. Treat it as an emergency: assessment the same day, because steroid treatment works best when started within the first days, and the window closes fast. Do not assume it is earwax or a blocked feeling that will clear.
What does it feel like?
Often noticed on waking, or as a pop followed by muffled hearing: one ear suddenly sounds like it is underwater, the phone stops working on that side, and there may be ringing, fullness, or dizziness. It is usually painless, which is exactly why people wait. The causes are mostly unclear, viral, circulatory, and inner-ear mechanisms are suspected, and many cases are classed as idiopathic, but the treatment clock does not wait for a cause.
What actually helps?
- Same-day assessment, no exceptions: urgent care, an emergency department, or an urgent GP appointment today, stating clearly that hearing dropped suddenly in one ear.
- Steroids early: corticosteroids, started ideally within the first days, improve the chance of recovery. Some specialists offer injection through the eardrum as an alternative or supplement.
- Rule out the mimics: clinicians first check for wax and infection, then arrange a hearing test, and usually an MRI to exclude rare structural causes like a vestibular schwannoma.
- Many recover, some fully: a substantial share of treated cases recover much or all hearing, especially with early treatment, but untreated or delayed cases risk permanent loss.
- Rehabilitation if loss persists: hearing aids, including CROS systems that route sound from the deaf side, restore function where recovery is incomplete.
When is it an emergency?
Sudden hearing loss itself is the emergency: today, not this week. Go immediately, call 911, if sudden hearing loss comes with severe dizziness and inability to walk, facial weakness, slurred speech, double vision, or severe headache, since those suggest stroke rather than an ear problem. Sudden loss after head injury or a very loud blast also needs same-day assessment. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper.
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Common questions
Why is sudden hearing loss an emergency?
Because the one treatment that works, corticosteroids, has a window. Started within the first days, ideally the first 72 hours, steroids substantially improve recovery odds; weeks later, there is much less to offer. The ear's hair cells and nerve are injured by whatever struck, and the medicine reduces that inflammation while it is still reversible. Every day of waiting spends recovery chance you cannot buy back.
Could my sudden hearing loss just be earwax?
It could, and clinicians check for exactly that first, but you cannot tell the difference at home. Wax builds and muffles; sensorineural loss arrives abruptly, often with ringing or fullness, and the phone trick is telling: if the phone suddenly sounds dead on one side, that is not wax behavior. The safe rule: sudden one-sided loss gets seen the same day, and the examiner rules wax in or out in seconds.
What causes sudden sensorineural hearing loss?
Usually no proven cause: suspected mechanisms include viral injury to the inner ear, disrupted blood supply, and inner-ear membrane problems, and most cases are labeled idiopathic. Identifiable causes in a minority include Meniere's disease, autoimmune conditions, acoustic trauma, and rarely a benign tumor on the hearing nerve, which is why MRI follows. The cause being unclear does not slow treatment: steroids start on suspicion.
Will my hearing come back?
Many people recover substantially, particularly with early treatment, and milder losses do best. Recovery, when it comes, usually happens over the first two weeks to two months. A share of cases recover incompletely or not at all, which is the honest answer, and why speed matters. Persistent one-sided loss is very manageable: modern hearing aids and CROS systems restore day-to-day function.
What is the treatment for sudden hearing loss?
Corticosteroids, either tablets or injections through the eardrum directly into the middle ear, started as early as possible. A hearing test documents the loss, and MRI usually follows to exclude a structural cause. Where recovery is incomplete, hearing rehabilitation follows. There is no proven role for antivirals or vasodilators beyond the steroid core, despite much historical experimentation.
Does sudden hearing loss happen in both ears?
Typically one ear; both ears at once is rare and more alarming, pointing toward systemic causes like autoimmune disease, certain drugs, or meningitis, and it is even more urgent. The one-sided version is the classic emergency. Either way the instruction is identical: same-day assessment, stating plainly that the hearing loss was sudden.