Sudden Hearing Loss: Why It Is a Medical Emergency

You wake up one morning and one ear feels completely plugged. You think it is earwax or maybe a cold. You wait a day or two to see if it clears up. By the time you get to a doctor, the window for the most effective treatment has already narrowed significantly.

Sudden sensorineural hearing loss, often called sudden deafness, is a rapid loss of hearing that occurs over hours or up to three days, almost always in one ear. It affects roughly 5 to 20 per 100,000 people each year, and many cases go unreported because people assume it will resolve on its own.

It usually does not.

What sudden hearing loss feels like

Most people describe one or more of the following:

• Waking up with one ear that sounds muffled or dead
• A loud pop followed by hearing loss
• Hearing that drops noticeably over the course of a few hours
• Fullness or pressure in one ear
• Ringing or buzzing (tinnitus) that appears suddenly
• Dizziness or vertigo along with the hearing change

The hearing loss is almost always one-sided. If both ears are affected, the cause is more likely something else, and the evaluation will look different.

The critical mistake most people make is assuming it is just earwax, a cold, or fluid in the ear. Those conditions do cause temporary hearing changes, but they feel different from sensorineural loss, and the stakes are very different if you guess wrong.

Why timing matters

Sudden sensorineural hearing loss is treated most effectively within the first 72 hours. The standard treatment is a course of oral corticosteroids, which reduce inflammation in the inner ear and give the damaged hair cells the best chance of recovering.

Studies consistently show that patients who begin steroid treatment within the first few days have significantly better outcomes than those who wait a week or more. Some recover most or all of their hearing. Others recover partially. But the longer treatment is delayed, the lower the odds of meaningful recovery.

After two to four weeks, the chances of improvement drop substantially. After that window closes, whatever hearing remains is likely permanent.

This is why sudden hearing loss is treated as a medical emergency by audiologists and ENT specialists. Not because it is life-threatening, but because the treatment window is narrow and the consequences of missing it are permanent.

What causes it

In about 85 to 90 percent of cases, no specific cause is identified. This is called idiopathic sudden sensorineural hearing loss. The leading theories include:

Viral infection. A virus may inflame the cochlea or the auditory nerve. Many cases follow an upper respiratory infection. Viruses like herpes simplex, cytomegalovirus, and influenza have been associated with sudden hearing loss.

Vascular disruption. The blood supply to the inner ear is fragile. A small clot, spasm, or disruption in blood flow can starve the hair cells of oxygen, causing rapid damage.

Autoimmune inner ear disease. The body’s immune system mistakenly attacks the inner ear, causing inflammation and hearing loss.

Meniere’s disease. This inner ear condition involves fluctuating hearing loss, tinnitus, and vertigo. Sometimes the first episode presents as a sudden hearing drop.

In a small number of cases, sudden hearing loss is caused by an acoustic neuroma, a benign tumour on the auditory nerve. This is uncommon but is one reason imaging is sometimes recommended as part of the workup.

What to do if it happens to you

Go to your doctor or an emergency room within 24 hours. Do not wait to see if it improves. Mention that you have sudden hearing loss in one ear. The word “sudden” matters because it signals the need for urgent evaluation and steroid treatment.

Get a hearing test as soon as possible. A formal audiogram confirms the type and degree of hearing loss and establishes whether it is sensorineural (inner ear or nerve) versus conductive (middle ear or outer ear). This distinction determines the treatment.

Follow through on treatment. If steroids are prescribed, take the full course. If oral steroids do not produce improvement, intratympanic steroid injections (a steroid injected directly through the eardrum into the middle ear) may be offered as a second-line treatment.

Follow up. Your hearing should be retested after treatment to track recovery. Some improvement may occur over weeks. If hearing does not recover fully, a hearing aid for the affected ear can make a meaningful difference.

What about the other ear

People who experience sudden sensorineural hearing loss in one ear are at a slightly elevated risk of experiencing it in the other ear at some point. The overall risk is still low, but it makes regular hearing monitoring a good idea going forward.

Protecting the hearing you have, in both ears, becomes even more important after an episode of sudden loss.

Getting evaluated in Edmonton

If you experience a sudden change in hearing, especially in one ear, contact your doctor or visit an emergency room immediately. If you need a diagnostic hearing test, our Edmonton audiologists can provide one.

At Medicine Place Hearing Care, we can perform a same-day audiogram when sudden hearing loss is suspected. We work with your physician or ENT specialist to ensure you get the right treatment in the right timeframe.

Do not wait and hope. Time is the one thing you cannot get back.

Contact Medicine Place Hearing Care in Edmonton for urgent hearing assessment.