Losing hearing in one ear can range from a minor blockage to a medical emergency, and the difference often comes down to how quickly it happened. If your hearing disappeared suddenly, within minutes or hours, treat it as urgent. You have the best chance of recovery if treatment starts within 72 hours, and the window closes almost entirely after two to four weeks.
If the loss came on gradually or follows a cold, allergies, or a flight, the cause is more likely a temporary blockage. Either way, figuring out what type of hearing loss you’re dealing with helps you take the right next step.
Sudden Loss Is a Medical Emergency
Sudden sensorineural hearing loss, where the inner ear or hearing nerve stops working properly, affects roughly 5 to 27 people per 100,000 each year. Without treatment, somewhere between 32% and 65% of people recover on their own. But those odds improve significantly with early medical care: 80% of patients treated within two weeks show some degree of improvement.
The standard treatment is a course of oral steroids, typically lasting one to two weeks with a gradual taper afterward. If oral steroids don’t work, doctors can inject steroids directly through the eardrum into the middle ear. The key factor in how well treatment works is timing. The greatest natural improvement in hearing happens in the first two weeks, and there’s little benefit to treatment started after four to six weeks.
If you woke up deaf in one ear, or the hearing dropped out during the day for no obvious reason, go to an urgent care or emergency room today. Don’t wait to see if it gets better on its own.
Two Types of Hearing Loss Feel Different
Understanding which type of loss you’re experiencing helps you gauge how urgently you need to act.
Conductive hearing loss happens when something physically blocks sound from reaching your inner ear. Earwax, fluid from an infection, a swollen eustachian tube, or even a foreign object in the ear canal can cause this. It often feels like wearing an earplug: sounds are muffled but not distorted. Your own voice may sound louder in the blocked ear.
Sensorineural hearing loss happens when the delicate hair cells inside the cochlea or the hearing nerve itself are damaged. Sounds aren’t just quieter, they can seem unclear or garbled. You might notice that voices sound tinny, or that you can hear someone talking but can’t make out the words. Your own voice typically sounds quieter in the affected ear, not louder.
Conductive losses are often reversible once the blockage clears. Sensorineural losses are more serious and sometimes permanent, which is why sudden cases need fast treatment.
Common Causes of One-Sided Hearing Loss
Earwax Buildup
Earwax is the most common harmless cause. A plug of hardened wax can seal off the ear canal completely, cutting your hearing on that side. This tends to build up slowly and may worsen after swimming or using earbuds that push wax deeper.
Eustachian Tube Dysfunction
The eustachian tube connects your middle ear to the back of your throat and helps equalize pressure. When it swells shut, fluid can build up behind the eardrum, muffling your hearing. Common triggers include colds, the flu, allergies, and acid reflux. Altitude changes during flights, mountain driving, or scuba diving can also cause it. In most cases, eustachian tube dysfunction resolves on its own within one to two weeks.
Ear Infections
Middle ear infections trap fluid and pus behind the eardrum. The pressure and swelling reduce how well the eardrum vibrates, which dulls hearing on that side. You’ll usually have ear pain, a feeling of fullness, and sometimes fever alongside the hearing loss.
Noise Exposure or Trauma
A single loud blast near one ear, like a firecracker or gunshot, can damage the hair cells in the cochlea on that side. This type of sensorineural loss may be accompanied by ringing (tinnitus) and can be permanent if the damage is severe enough.
What You Can Safely Try at Home
If you suspect earwax is the problem, over-the-counter softening drops (typically mineral oil, baby oil, or hydrogen peroxide-based solutions) can help loosen the plug over a few days. Tilt your head so the affected ear faces up, apply a few drops, and let them sit for several minutes before tilting your head to drain.
Never dig into your ear with cotton swabs, hairpins, or any pointed object. You risk pushing wax deeper, scratching the ear canal, or puncturing the eardrum. Don’t use ear drops if you suspect an infection or a perforated eardrum, since the liquid can reach the middle ear and make things worse.
For eustachian tube congestion, swallowing, yawning, or gently blowing with your nose pinched shut (the Valsalva maneuver) can sometimes pop the tube open. Over-the-counter decongestants or antihistamines may help if allergies or a cold triggered the problem. If the muffled feeling persists beyond two weeks, it’s worth getting checked.
Warning Signs That Need Prompt Attention
Certain symptoms alongside one-sided hearing loss point to more serious causes. A benign tumor called an acoustic neuroma (vestibular schwannoma) grows on the hearing and balance nerve and typically causes gradual hearing loss in one ear over months to years. But the hearing loss is sometimes sudden. Other signs of an acoustic neuroma include persistent ringing in one ear, dizziness or balance problems, and facial numbness or weakness. These tumors are not cancerous, but they can press on nearby nerves and brain structures as they grow, so early detection matters.
Get evaluated promptly if your one-sided hearing loss comes with any of the following:
- Sudden onset with no obvious cause like a cold or earwax
- Ringing or buzzing in the affected ear that doesn’t go away
- Dizziness or vertigo, especially if the room seems to spin
- Facial numbness, tingling, or weakness on the same side
- Ear pain with discharge, which may signal an infection that needs antibiotics
What Happens at the Doctor’s Office
A doctor will first look inside your ear with an otoscope to check for wax, fluid, redness, or eardrum damage. If the cause isn’t visible, you’ll likely be referred for a hearing test called pure-tone audiometry. During this test, you wear headphones and respond to tones at different pitches and volumes. The audiologist maps which frequencies you can hear and at what volume, creating a chart called an audiogram.
The test covers frequencies from 250 to 8,000 Hz, which spans most of the speech range. Your results are measured in decibels: 0 to 25 dB is normal hearing, 26 to 40 dB is mild loss, 41 to 55 dB is moderate, and anything above 70 dB is severe to profound. The audiologist also tests how well you understand spoken words, not just whether you can detect sound, since sensorineural damage often affects clarity more than volume.
Bone conduction testing helps determine whether the problem is in the outer/middle ear or the inner ear. You wear a small vibrator behind the ear that sends sound directly to the cochlea, bypassing the ear canal and eardrum entirely. If you hear well through bone conduction but poorly through headphones, the issue is conductive. If both are reduced, it’s sensorineural.
For suspected sensorineural loss, especially sudden cases, an MRI may be ordered to rule out an acoustic neuroma or other structural problems.
Treatment Depends on the Cause
Earwax removal by a professional is quick. They may flush the canal with warm water, use a small suction device, or scoop out the wax with a specialized tool called a curette. If you’re prone to buildup, they can show you how to use softening drops regularly to prevent future blockages.
Ear infections are treated with antibiotics if bacterial. The hearing loss from an infection almost always resolves once the fluid drains and the inflammation settles, though this can take a few weeks after the infection clears.
For sudden sensorineural hearing loss, the steroid regimen is time-sensitive. If oral steroids don’t produce improvement, intratympanic steroid injections are the next step. Some patients recover fully, others regain partial hearing, and some are left with permanent loss on that side. The single biggest predictor of outcome is how quickly treatment begins.
When hearing loss in one ear is permanent, options include hearing aids designed for single-sided deafness, or CROS (contralateral routing of signal) devices that pick up sound on the deaf side and transmit it to the hearing ear. These won’t restore normal hearing, but they reduce the difficulty of following conversations and locating where sounds come from.