Sudden Hearing Loss: Why It's a Medical Emergency and What to Do

What Counts as Sudden Hearing Loss

Sudden sensorineural hearing loss (SSNHL), sometimes called sudden deafness, is a rapid loss of hearing caused by a problem in the inner ear or the hearing nerve. NIDCD describes the clinical definition as a loss of at least 30 decibels across three connected frequencies within 72 hours. ^[2] In everyday terms, that's roughly the difference between hearing normal conversation clearly and hearing it as a faint murmur.

It's different from the gradual decline of age-related hearing loss, which develops over years in both ears. The American Academy of Otolaryngology's clinical guideline estimates sudden sensorineural hearing loss affects 5 to 27 people per 100,000 each year, about 66,000 new cases annually in the U.S. ^[1]

How It Usually Shows Up

Sudden deafness frequently affects only one ear. Many people notice it when they wake up, or when they switch the phone to the other ear. Some hear a loud "pop" just before the hearing goes, and it's often accompanied by a feeling of fullness in the ear, dizziness, or ringing (tinnitus). ^{[2] [1]}

The tricky part is that a blocked ear from wax, fluid, or a cold can feel similar. Those are conductive problems, meaning sound can't get through the outer or middle ear, and they're usually far less urgent. That's why the guideline's first recommendation is that clinicians distinguish sensorineural from conductive hearing loss at the very first visit. ^[1] If you know you're prone to earwax buildup, it's still worth getting checked rather than assuming, because the two can't be reliably told apart at home.

Doctors often use a simple tuning-fork check called the Weber test: with sensorineural loss, sound tends to be heard louder in the better ear, while with conductive loss it shifts toward the blocked ear. ^[4] But a study of 319 patient records found the test can mislead, and its authors concluded formal audiometry should be used in every case. ^[5] Treat any self-check as a reason to call a doctor, not a reason to wait.

What Causes It

In most cases, no specific cause is ever found. The guideline states that over 90 percent of sudden sensorineural hearing loss is idiopathic, meaning of unknown cause. ^[1] Suspected contributors include viral infections, problems with blood flow to the inner ear, autoimmune conditions, head trauma, and exposure to certain toxic substances. ^[3] Some medications can damage hearing, which is covered in our guide to ototoxic medications.

A small share of cases trace back to a benign tumor on the hearing nerve. That's one reason imaging is part of the standard workup; see our article on acoustic neuroma for more on that condition. Sudden hearing loss in one ear can also be part of Meniere's disease, which typically comes with episodes of vertigo.

Why Timing Matters So Much

NIDCD is direct about this: consider sudden deafness symptoms a medical emergency and see a doctor immediately. It warns that treatment delayed for more than two to four weeks is less likely to reverse or reduce permanent hearing loss. ^[2] The clinical guideline recommends a hearing test as soon as possible, within 14 days of symptoms starting, and frames steroid treatment as an option within two weeks of onset. ^[1]

A review in the New England Journal of Medicine likewise describes sudden sensorineural hearing loss as an otologic emergency. ^[6] In practical terms: if you suddenly lose hearing in one or both ears without an obvious explanation, contact a doctor the same day, and ask whether you should see an ear, nose, and throat specialist (otolaryngologist) urgently. If the hearing loss comes with other neurological symptoms, such as facial drooping, weakness, slurred speech, or a severe headache, seek emergency care right away.

What Doctors Do: Testing and Treatment

The 2019 AAO-HNS guideline lays out what to expect: ^[1]

• A hearing test (audiogram) to confirm the type and degree of loss.
• Imaging or nerve testing. Clinicians should evaluate for causes behind the inner ear using MRI or an auditory brainstem response test. Routine head CT scans and routine lab panels are not recommended.
• Corticosteroids offered as an option, by mouth or injected through the eardrum (intratympanic), ideally within two weeks. NIDCD notes that since 2011, research has shown intratympanic steroids to be as effective as oral steroids. ^[2]
• Hyperbaric oxygen therapy as an option combined with steroids, within two weeks as initial treatment or within a month as salvage treatment.
• Salvage steroid injections recommended for people with incomplete recovery two to six weeks after onset.
• Follow-up hearing tests at the end of treatment and within six months.

The guideline recommends against routinely using antivirals, clot-dissolving drugs, vasodilators, or other blood-flow drugs, because the evidence doesn't support them. ^[1]

Recovery and Outlook

There is real reason for hope. NIDCD reports that about half of people with sudden sensorineural hearing loss recover some or all of their hearing spontaneously, usually within one to two weeks. ^[2] Published estimates of spontaneous recovery vary widely, from about 25 to 65 percent, depending on the study population. ^[3] Outcomes tend to be better when the loss is milder, when there's no vertigo, and when evaluation happens early.

For people left with lasting hearing loss in one ear, the guideline recommends counseling about hearing rehabilitation options, which can include hearing aids or other devices. ^[1] Persistent tinnitus is also common afterward; our guide to tinnitus covers what helps.

After You Have Been Checked, a Daily Routine

Sudden hearing loss needs urgent medical care, and nothing should delay a call to your doctor. Once you have been seen and have your doctor's guidance, many people like to add a daily wellness habit, and Audifort is designed to support healthy hearing. The 90-day money-back guarantee makes it a risk-free way to try.

See Audifort and the 90-day guarantee →