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Medically reviewed guide · Last updated: 1 August 2026 · Reading time: approx. 8 min
Hearing Loss: Sudden or Gradual — What Lies Behind It
At a glance
The decisive question is how quickly it came on.Hearing loss that develops overnight leads to a completely different line of thinking from one that creeps in over years.
Sudden, in one ear, with no recognisable causepoints to sudden sensorineural hearing loss. This is not an emergency in the sense of calling 112 (emergency services in Germany) — but it is not something to sit out for days either: see an ENT practice within a few days.
Gradual and in both earsfits better with age-related hearing loss or noise damage. The most common harmless cause of an ear that suddenly sounds muffled, by contrast, is simply a plug of earwax.
Medicines can damage your hearing(an ototoxic effect). New noises in the ear or reduced hearing on a new medication should always be reported to the practice that prescribed it — some of it can reverse if you act early.
Do not put off getting hearing aids.Untreated hearing loss costs you conversation, participation and concentration; fitting them takes time and getting used to in any case.
Get checked without delaysudden hearing loss in one ear, hearing loss with severe spinning dizziness and vomiting, with facial paralysis, after a head injury or acoustic trauma, or with a high fever and severe earache.
The most common causes compared
Cause
How it develops
Typical accompanying signs
First step
Plug of earwax
Suddenly muffled, often after showering or using cotton buds
Feeling of pressure, your own voice sounds hollow, no dizziness
Do not poke around yourself — have it removed at the practice
Sudden sensorineural hearing loss
Within hours, usually in one ear
Noise in the ear, a cotton-wool feeling, sometimes mild unsteadiness
ENT practice promptly, do not wait for days
Middle ear infection or effusion behind the eardrum
Over days, often after a cold
Earache, pressure, in children fever and grizzling
See your GP practice or an ENT practice
Age-related hearing loss (presbyacusis)
Over years, slowly, in both ears
High tones go first, following speech in a hubbub becomes hard
Hearing test (audiometry), discuss hearing aids
Noise damage
Gradually over years — or all at once after acoustic trauma
Noise in the ear after exposure, a notch at high tones on the hearing test
Remove the source of noise, ear protection, hearing test
Ménière's disease
In attacks, over hours, recurring
Spinning dizziness with noise in the ear and pressure, hearing fluctuates
ENT assessment, keep a record of attacks
Ototoxic medicines
Usually gradual in both ears, less often rapid during an infusion
Ringing in the ears as an early sign, high tones drop out first
Inform the prescribing practice, stop nothing on your own
Table scrolls to the right
A change in hearing on a new medication?
Record what you took and when — free in the brite app.
Clinically, a distinction is made between conductive hearing loss (sound does not reach the inner ear properly — the ear canal, eardrum and middle ear are involved) and sensorineural hearing loss (the inner ear or the hearing nerve no longer processes sound cleanly). That is why an ENT practice first looks into the ear and then carries out a hearing test.
Plug of earwax: the most common harmless cause
Earwax only becomes a problem once it blocks the ear canal completely — then hearing turns muffled all at once, often after a shower, because the wax swells up. A feeling of pressure and a hollow-sounding voice of your own are typical alongside it. Cotton buds are the most common cause here and not the solution: they push the wax in deeper. At the practice, the plug is removed in a few minutes.
In sudden sensorineural hearing loss, hearing in one ear drops within hours with no recognisable cause. Many people describe it as "cotton wool in the ear", often accompanied by noise in the ear and a slight unsteadiness. Pain is expressly not part of the picture.
To put it in perspective, since this often slips online: sudden sensorineural hearing loss is not an emergency in the sense of calling 112 (emergency services in Germany), but nor is it a case for "let's have a look in a fortnight". The advice comes down to presenting at an ENT practice within a few days. In some of those affected, tinnitus remains even when the hearing comes back.
Middle ear infection and effusion behind the eardrum
With a middle ear infection, fluid collects behind the eardrum and sound is passed on in muffled form; earache is usually the dominant complaint. An effusion without acute inflammation, by contrast, often does not hurt at all: it is noticed only because a child responds poorly, or because adults hear as though "under water" for weeks after a cold. If it persists, it needs checking — in children also because of speech development.
Age-related hearing loss: the slow classic
Presbyacusis comes from wear on the hair cells in the inner ear. It begins with the high tones, in both ears, and creeps in over years. What stands out is rarely the volume — it is intelligibility: in a quiet one-to-one conversation everything works, in a restaurant it no longer does. Consonants such as s, f, t and k carry most of the information and sit exactly in the frequency range that goes first. It is also typical that the people around you notice it sooner.
Noise damage: the part you can influence yourself
Constant noise, loud music through headphones and concerts damage the hair cells cumulatively, and that damage cannot be repaired. One warning signal is a noise in the ear after a loud event: if it disappears after a night's sleep it was a warning shot; if it stays, it needs assessing. Acoustic trauma, by contrast, strikes all at once and needs examining promptly.
Ménière's disease: dizziness, pressure in the ear and fluctuating hearing
Here severe spinning dizziness, a noise in the ear and a feeling of pressure in the ear occur together in attacks, typically over minutes to hours. What is characteristic is that hearing fluctuates in the process. If you also notice persistent balance problems, say so explicitly.
Rarer causes
Hearing loss in one ear with a noise in that same ear over months — here a benign growth on the hearing nerve is occasionally looked for; rare, but the reason one-sided findings are taken more seriously.
A perforated eardrum — after a blow to the ear, a dive or a foreign body, often with a brief stabbing pain.
Otosclerosis — a slowly progressing hardening of bone in the middle ear.
Self-checks: first clues for home
These observations do not replace a diagnosis. But they help you narrow the problem down and describe what you notice more precisely at your appointment.
The side-by-side comparison: cover one ear at a time and listen to the same source of sound, running water for example. If one ear is clearly worse, that is the single most important finding for your appointment.
The whispered voice test: someone stands an arm's length behind you to one side, you block the other ear, and they whisper two-syllable words or numbers after breathing out. Fewer than half repeated correctly is a signal. The test is rough and depends heavily on how quietly the whispering really is.
The restaurant test: do you follow speech well in quiet surroundings but barely at all in a hubbub of voices? That points to high-frequency hearing loss and not to other people "mumbling".
The cotton-wool test: does the ear also feel blocked and does your own voice sound hollow? That shifts the suspicion more towards the ear canal and middle ear.
Hearing test apps, honestly assessed. Apps on your smartphone can give you a rough sense of whether something is not right. But they do not replace audiometry: the result and how much it tells you depend enormously on the headphones, the background noise and the calibration. As a reason to book an appointment they are useful — as an all-clear they are worthless.
Warning signs: when not to wait
Sudden hearing loss in one ear, with no recognisable explanation
Hearing loss together with severe spinning dizziness, vomiting or unsteadiness on your feet
Hearing loss with paralysis down one side of the face
Hearing loss after a fall, a blow to the head or acoustic trauma
High fever, severe earache, redness or swelling behind the ear
Bloody or purulent discharge from the ear
New hearing loss or new ringing in the ears shortly after starting a new medication
Go straight to A&E Hearing loss after a head injury, with newly developed facial paralysis, with extreme spinning dizziness and vomiting, or with a high fever and painful swelling behind the ear needs examining the same day. If speech or vision problems, sudden paralysis or reduced consciousness are added to the picture, call 112 (emergency services in Germany).
Sudden sensorineural hearing loss: urgent, but not a 112 case Sudden hearing loss in one ear without pain and without neurological signs does not justify an emergency call — but nor does it justify waiting for weeks. On the phone, say explicitly "sudden hearing loss in one ear"; that is a different level of urgency from "my ear feels odd". How to prepare for conversations like this is set out in the guide Preparing for a doctor's appointment.
The treatment pathway: step by step
A look into the ear canal. Otoscopy: a plug, a foreign body, a defect in the eardrum or an effusion? A great deal is explained by this alone and dealt with in the same appointment.
Hearing test (audiometry). The pure-tone audiogram shows which frequencies are affected and whether this is a conductive or a sensorineural problem. Speech discrimination tests are added to it.
Treat the cause. For sudden sensorineural hearing loss, a course of steroids is often discussed — the evidence for it is not as clear-cut as the widespread use of the treatment suggests; the decision rests with the practice treating you.
Further investigation for one-sided findings. If reduced hearing in one ear remains unexplained, further examinations follow, and imaging if needed.
Plan the hearing aids. For permanent hearing loss: fitting through an ENT practice and a hearing aid audiologist; for very severe loss, implantable solutions come into question.
Hearing aids: why putting it off is the worse option
The most common pattern is not refusal but delay: years often pass between first noticing it and being fitted. That is unhelpful, because the brain needs time to get used to the sound picture. And untreated hearing loss changes everyday life by stealth: going out among people less, tiring faster in conversations, more frequent problems with concentration.
Put cautiously, there is also this: untreated hearing loss is named as one of the modifiable risk factors for dementia. That is not proof of cause and effect, and a hearing aid is not dementia prevention — but as an argument against putting things off for years, the link does the job well enough.
The medication angle: substances that put a strain on hearing
Ototoxic means: an active substance can damage the hair cells in the inner ear or the balance organ. Only a few groups of substances are involved, but the damage is sometimes permanent. Important to say first: none of these substances is prescribed without a reason, and none of them is to be stopped on your own because of this section. The point is to recognise an early sign and report it.
High-dose loop diuretics
Water tablets such as furosemide and torasemide can, at high doses — above all when given rapidly into a vein and when kidney function is impaired — cause temporary hearing loss and noises in the ear. At usual tablet doses this is rare. What becomes critical is the combination with a second ototoxic substance.
Certain antibiotics
The classic group is the aminoglycosides, antibiotics used in hospital for severe infections. They can damage both hearing and the balance organ, and that damage is not always reversible. This is why blood levels and kidney values are monitored during treatment and the course is kept as short as possible.
Ear drops follow a logic of their own: with a perforated eardrum, drops containing aminoglycosides are regarded as problematic, because the active substance can reach the inner ear; substances such as ciprofloxacin are then used instead. For the same reason, ear drops are not a matter for self-medication when it is unclear whether the eardrum is intact. The general principles are set out in the guide Taking antibiotics correctly.
Cisplatin and other chemotherapies
Platinum-based cytotoxic drugs, cisplatin above all, are among the best-documented ototoxic substances. The hearing loss typically begins at the very high frequencies, is dose-dependent and is frequently permanent. That is why hearing tests before, during and after such treatments are a fixed part of many treatment protocols. Report any change in hearing immediately, even if it seems minor to you.
High-dose salicylates
A special case straight out of the textbook: acetylsalicylic acid and related salicylates can trigger ringing in both ears at high doses. What is notable: it is as a rule reversible and is regarded as the classic early sign of a salicylate dose that is too high. For low-dose use to thin the blood, this is not a relevant issue.
The one rule worth rememberingNew noises in the ear or newly reduced hearing on a new medication should always be reported — to the prescribing practice or the pharmacy, and promptly rather than at the routine appointment after next. With some substances the change is reversible if you act early; with others, further damage can be limited. Do not stop anything on your own. How to record side effects systematically is shown in the guide Medication side effects.
A simple timeline helps: since when have you been taking which substance, and since when has the noise in the ear been there? That is exactly what a well-kept medication plan is for. In later life it is also worth a look at Medications in old age.
Since when have you taken what — and since when has it been ringing?
Medicines and complaints in one history you can show at your appointment.
How to protect your hearing — and live better with it
Take noise seriously before it hurts — ear protection when working with machinery and at concerts. Hair cells do not grow back.
The headphone rule — the louder, the shorter. And hands off cotton buds: they create the plug they are meant to remove.
A hearing test as routine — from midlife onwards it belongs in the same category as an eye test. A baseline result is valuable, because later changes can be measured against it — particularly before treatment that can put a strain on your hearing.
Adapt everyday life rather than cover it up — switch subtitles on, bring the person you are talking to into view, tell those around you openly. Withdrawing from conversation is the real consequence of untreated hearing loss.
Noise in the ear, dose, date — in one place
So that at your ENT appointment it is the record that speaks, not your memory.
Sudden sensorineural hearing loss is not an emergency in the sense of calling 112 (emergency services in Germany) and not a reason to drive to A&E at night. It is urgent nonetheless: present at an ENT practice within a few days rather than waiting for weeks. It is different if severe spinning dizziness, facial paralysis or neurological deficits occur as well — then it needs examining immediately.
The known groups include high-dose loop diuretics such as furosemide and torasemide, aminoglycoside antibiotics, platinum-based chemotherapies such as cisplatin and high-dose salicylates. The risk depends heavily on dose, duration, kidney function and other medicines taken alongside. Do not stop anything on your own; report new noises in the ear or reduced hearing to the prescribing practice promptly.
Ringing in the ears on high-dose salicylates is regarded as the classic early sign of a dose that is too high and as a rule settles once the dose is reduced or the medicine is stopped. That is a reason to raise it with your doctor rather than sit it out. With low-dose use to thin the blood, this effect plays virtually no role.
If the hearing test shows a relevant loss, there is little to be said for waiting. Getting used to it is easier the earlier you start, and untreated hearing loss often leads to withdrawal from conversation. Untreated hearing loss is also discussed as one of the modifiable risk factors for dementia — that does not prove cause and effect, but it is still an argument against putting things off for years.
One-sided findings are taken more seriously than two-sided ones, because a specific cause lies behind them more often. In rare cases a benign growth on the hearing nerve is looked for. Panic is not called for, an ENT assessment is — above all if the finding persists over weeks.
Gesundheitsinformation.de (IQWiG, the German institute for quality in health care): Hearing loss and sudden sensorineural hearing loss. Accessed 2026. — German source
gesund.bund.de (German national health portal): Hearing loss, earwax and hearing aid provision. Accessed 2026. — German source
Guidelines of the German Society of Oto-Rhino-Laryngology, Head and Neck Surgery (DGHNO-KHC) in the AWMF register: sudden sensorineural hearing loss and tinnitus. Accessed 2026. — German source
Summaries of Product Characteristics for the substances named (furosemide, torasemide, ciprofloxacin, acetylsalicylic acid). Accessed 2026.
This article is for general information and does not replace medical advice, diagnosis or treatment. The self-checks described are a rough guide and replace neither an examination nor audiometry. Never stop prescribed medicines on your own. If you have sudden hearing loss in one ear, or hearing loss with severe spinning dizziness, facial paralysis, a high fever or after a head injury, please contact a doctor or the emergency services.
