Can COVID Cause Permanent Hearing Loss?

COVID-19 can cause hearing loss, and for a minority of affected patients, that loss appears to be permanent. The most common form is sensorineural hearing loss, meaning the damage occurs in the inner ear or auditory nerve rather than the outer or middle ear. A large South Korean cohort study found that young adults who had COVID-19 developed hearing loss at roughly three and a half times the rate of those who did not get infected. Most people who experience hearing changes after COVID recover within weeks, but a meaningful fraction do not, and researchers are still working out who is most at risk and why.

How Common Is Hearing Loss After COVID?

Pinning down exact numbers is tricky because studies use different definitions, follow different populations, and measure hearing in different ways. One of the more robust meta-analyses estimated the rate of hearing loss among COVID patients at about 3%, with tinnitus at roughly 4.5% and dizziness at about 12%.¹ That 3% figure sounds small until you consider how many people have been infected worldwide. A nationwide cohort study in South Korea, which tracked over a million young adults, found that the incidence of hearing loss in the COVID group was about 11.9 per 10,000 person-months compared to 3.4 in the uninfected group. For sudden sensorineural hearing loss specifically, the numbers were 1.8 versus 0.5 per 10,000 person-months.² That adjusted hazard was consistent across subgroups, which makes it harder to dismiss as coincidence.

A smaller clinical study that tested COVID-positive patients directly found that about 40% had sensorineural hearing loss on audiometry, though many of these patients were unaware of any change in their hearing.³ That disconnect between measurable hearing thresholds and what people actually notice is a recurring theme in this literature. Some of the damage may be subtle enough that you don’t realize it until you’re in a noisy restaurant struggling to follow conversation.

What Type of Hearing Loss Does COVID Cause?

Across multiple reviews, the dominant pattern is sensorineural hearing loss, which means the problem is in the cochlea (the snail-shaped structure in the inner ear) or in the nerve that carries signals from the cochlea to the brain.⁴ This matters because sensorineural damage is generally harder to reverse than conductive hearing loss, which involves problems in the outer or middle ear like fluid buildup or ossicle damage. A small percentage of COVID patients do develop conductive hearing loss related to nasopharyngeal inflammation, and that type tends to clear up on its own as the swelling goes down.⁵

The severity ranges widely. Among patients with confirmed hearing loss in one review, about a fifth had mild loss, roughly a third had moderate loss, and another fifth had severe-to-profound loss.¹ That spread means some people notice only a slight muffling in one ear, while others lose functional hearing entirely. Sudden sensorineural hearing loss, where hearing drops dramatically over hours or a few days, has been reported in multiple case series and is one of the more alarming presentations.

How Does the Virus Damage Hearing?

Researchers have identified several ways COVID can harm the auditory system, and in many patients more than one mechanism may be at work simultaneously.

The most direct route involves the virus itself entering the inner ear. Lab work on adult human inner ear tissue showed that cochlear cells express the ACE2 receptor (the molecular doorway the virus uses to enter cells), along with two co-factors that help the virus get inside.⁶ Post-mortem examination of deceased COVID patients has turned up structures resembling the virus in middle ear tissue, along with significant damage to the cells there.⁷ So the virus can physically reach and infect the structures involved in hearing.

Blood supply disruption is another factor. The inner ear depends on a delicate network of tiny blood vessels, and COVID is known to cause clotting and blood vessel inflammation throughout the body. When the microcirculation to the cochlea is compromised, hair cells and nerve endings can be starved of oxygen and nutrients.⁸ Those hair cells do not regenerate in humans, so damage from even a brief interruption in blood flow can be irreversible.

Then there is inflammation. COVID triggers a powerful immune response that can include a surge of inflammatory molecules. These molecules, along with reactive oxygen species, can damage the auditory nerve and surrounding tissue. Researchers have found evidence of slowed nerve conduction in the brainstem pathways that process sound, consistent with post-infectious nerve damage.⁹ The inflammatory cascade seen in severe COVID overlaps with the same pathways implicated in sudden hearing loss from other causes, which may explain why the ear is vulnerable even when the infection is primarily respiratory.

When Does It Start, and How Long Does It Last?

Most patients who develop hearing changes notice them within the first month of infection. One study found that the median time from first COVID symptoms to hearing loss onset was about 10 days, though the range stretched from just a couple of days out to more than a month.¹⁰ Another study found that more than half of patients who developed hearing loss did so between 11 and 30 days after their confirmed infection.¹¹ The takeaway is that hearing loss can be an early symptom or a delayed one, so it is worth paying attention to your hearing for several weeks after a COVID infection.

The good news is that most patients’ hearing problems resolve relatively quickly. A narrative review concluded that the majority of patients who experienced hearing loss saw symptoms resolve within about two weeks.¹² Several follow-up studies found no lasting difference in standard hearing tests between recovered COVID patients and healthy controls at three months.¹³ But “most recover” is not “all recover.” In one longer-term follow-up of patients who reported hearing loss after COVID, about a third said their hearing had not improved at all by the time of their final assessment, months later.⁵ That subset represents the cases where hearing loss may well be permanent.

Tinnitus and Other Ear Symptoms

Hearing loss rarely travels alone after COVID. Tinnitus, the perception of ringing, buzzing, or hissing in the ears, is at least as common and sometimes more distressing. In one large survey of long COVID patients, about 28% reported developing tinnitus after their infection.¹⁴ Severity varied, but roughly a quarter of those with tinnitus rated it an 8 or higher on a 10-point scale.¹⁵ The worse the tinnitus, the less likely it was to resolve on its own, and severe cases were linked to a higher risk of long-term hearing loss and anxiety.¹⁴

Encouragingly, COVID-related tinnitus appears to have become less common over time. Cases decreased as vaccination became widespread and the Omicron variant replaced earlier strains, and researchers noted that psychological stressors from the pandemic itself may have contributed to tinnitus severity in earlier waves.¹⁶ Dizziness and vertigo round out the picture. Vestibular symptoms (balance problems, a spinning sensation) share the same underlying anatomy and blood supply as hearing, so when the cochlea is affected, the vestibular system often is too.

Damage Beyond the Ear

Some of the hearing-related complaints after COVID are not really about the ear at all. Researchers have found evidence of central auditory processing problems, meaning the brain’s ability to interpret sound is impaired even when the ear itself is sending signals normally. Patients with long COVID performed significantly worse on tests of speech understanding in noise, sound pattern recognition, and gap detection compared to healthy controls.¹⁷ Tests of higher-order auditory processing showed slower cortical responses in long COVID patients, suggesting that cognitive-auditory integration was affected alongside basic hearing.¹⁸

This helps explain a frustrating phenomenon that some long COVID patients describe: their hearing test comes back “normal,” but they still struggle to understand people in everyday conversation. The standard hearing test measures whether you can detect pure tones at various frequencies. It does not capture how well your brain processes complex sounds like speech in background noise. A study comparing long COVID patients with matched controls found that the two groups had similar pure tone thresholds, yet the long COVID patients reported significantly greater perceived hearing handicap and were more likely to have frequent tinnitus.¹⁹ Brainstem-level auditory responses were altered in these patients, pointing to damage in the neural pathway between the ear and the brain rather than the ear alone.

Treatment Options and How Well They Work

If you notice sudden hearing loss after COVID, getting treatment quickly matters. The standard first-line treatment is corticosteroids, which reduce the inflammation thought to drive much of the damage. In one study of 20 patients with post-COVID sensorineural hearing loss treated with oral corticosteroids, about two-thirds showed complete recovery within a month, while the remaining third did not improve.²⁰ That month timeline is important: improvement was gradual and did not happen in the first few days, so sticking with the full course is essential.

For patients who do not respond to oral steroids alone, injecting corticosteroids directly into the middle ear appears to help. A comparative study found that patients who received both oral and injected steroids had much better outcomes than those on oral steroids alone. In the combined treatment group, about 83% achieved complete recovery, compared to roughly 42% in the oral-only group.²¹ The injection delivers a concentrated dose of anti-inflammatory medication right where it is needed, bypassing the rest of the body.

For the small number of patients who develop profound hearing loss that does not respond to any medical treatment, cochlear implants become an option. At least one case report documented a patient who lost hearing bilaterally after severe COVID, underwent cochlear implantation, and achieved 88% intelligibility of disyllable words and 96% sentence recognition in quiet afterward. The authors emphasized that implant surgery should not be delayed in these cases, since the inflammation can lead to scarring inside the cochlea that makes electrode insertion progressively more difficult.²²

Children Are Not Immune

The early months of the pandemic focused heavily on adult outcomes, but children can develop hearing loss after COVID too. One clinical series found that about 23% of pediatric COVID patients presented with hearing loss or tinnitus, and all confirmed hearing loss cases were sensorineural.²³ In a separate report of three children who developed sudden sensorineural hearing loss after COVID, all had severe unilateral loss affecting all frequencies.²⁴ Hearing loss in children carries different stakes than in adults: even mild unilateral loss can affect language development, academic performance, and social interaction. Any child recovering from COVID who seems to be responding inconsistently to sounds or struggling more in noisy classrooms deserves a hearing evaluation.

Can COVID Vaccines Cause Hearing Loss?

Early in the vaccine rollout, anecdotal reports surfaced linking COVID vaccination to sudden hearing loss, which understandably alarmed people. The data, however, has been reassuring. A large study examining sudden sensorineural hearing loss rates after the first vaccine dose found that the incidence across all three major vaccines did not exceed the background rate of sudden hearing loss in the general population.²⁵ A separate analysis looking at the specific risk in the two months following vaccination also found no increased risk, with adjusted rate ratios below 1.0 for all three vaccine types.²⁶ In other words, people who happened to develop sudden hearing loss after their vaccination were not experiencing it at a higher rate than the general population would have anyway. This does not mean it can never happen in a rare individual case, but the population-level evidence shows no signal of a vaccine-driven risk.

Medications Used to Treat COVID That Can Harm Hearing

There is an irony worth knowing about: some of the drugs used early in the pandemic to treat COVID can themselves damage hearing. A review identified six proposed COVID therapeutics with known ototoxic side effects, including hydroxychloroquine, azithromycin, and ivermectin.²⁷ Hydroxychloroquine in particular drew concern because it was widely prescribed early on, and its ototoxic potential increases when combined with other hearing-toxic drugs like azithromycin.²⁸ Most of these drugs have since fallen out of use for COVID, but for patients who received them in 2020 or 2021 and developed hearing problems around that time, the medication itself could be part of the explanation. Disentangling drug-induced hearing loss from virus-induced hearing loss in those early patients is genuinely difficult.

Subtle Hearing Damage You Might Not Notice

One of the more unsettling findings across multiple studies is that COVID can shift hearing thresholds even in people who never complained about their ears. When researchers compared post-COVID patients to matched controls using detailed audiometry, they found statistically significant differences in pure tone thresholds, speech recognition scores, and high-frequency hearing.²⁹ Another study found lower otoacoustic emission amplitudes, a marker of outer hair cell function in the cochlea, at higher frequencies in the patient group.³⁰ These are subclinical changes, meaning they show up on testing but may not yet cause noticeable problems in daily life. Whether this subclinical damage progresses over time, perhaps accelerating age-related hearing decline years down the road, is an open question nobody can answer yet. It does suggest that the true burden of COVID-related hearing damage may be larger than the number of people who walk into a clinic complaining about their ears.

Not all studies agreed on this point. At least one study comparing COVID patients (including those who had pneumonia) with healthy controls found no significant difference in standard hearing tests or otoacoustic emissions at one and three months.¹³ Differences in when testing was performed, how severe the infections were, and whether patients had other risk factors for hearing loss make it hard to draw a clean line. The evidence leans toward COVID causing measurable auditory effects in a substantial fraction of patients, but the variability between studies is real and worth acknowledging.

What to Do If You Suspect COVID-Related Hearing Loss

If your hearing seems different after a COVID infection, even mildly, get a formal hearing evaluation sooner rather than later. A standard test takes about 30 minutes and can pick up changes you might not notice on your own. Early treatment with steroids gives you the best shot at recovery, and waiting weeks to see if things improve on their own can narrow your treatment window. If you are also experiencing tinnitus, dizziness, or difficulty understanding speech in noise, mention all of those symptoms, because they point your clinician toward a fuller picture of what might be going on, including the central auditory processing issues that a basic hearing test alone would miss. For persistent or severe cases, referral to an ear specialist is warranted, and in the rare event of profound bilateral loss, cochlear implantation has produced good outcomes when pursued promptly.

1
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