Sudden Hearing Loss: Why It Is an Emergency and What to Do Next
Sudden hearing loss is not the same as gradual age-related change. When hearing drops noticeably in hours or a few days, it is a medical emergency. Timing matters. Here is when to seek care, what causes sudden sensorineural hearing loss, and when hearing aids come into the picture after medical evaluation.
Key takeaways
- Sudden hearing loss is a medical emergency. NIDCD: treat sudden deafness as a medical emergency. Delaying diagnosis and treatment can decrease effectiveness.
- Timing matters. Aim for evaluation within 72 hours. AAO-HNS 2019 guidelines emphasize treatment within 2 weeks of onset, but earlier is better.
- Cause is unknown in ~90% of cases. NIDCD notes that only 10 to 15 percent of SSHL cases have an identifiable cause. Known causes include infections, trauma, autoimmune disease, and ototoxic drugs.
- About half recover spontaneously. NIDCD: about half of people with SSHL recover some or all hearing within 1 to 2 weeks. Still seek prompt care.
- Do not buy amplification first. FDA red flags include sudden loss within 90 days. SSHL needs medical evaluation, not a hearing aid purchase. Amplification may help residual loss later after medical care.
People search for sudden hearing loss when their hearing drops noticeably in one ear overnight, after waking up, or over a couple of days. It is not the same as the gradual high-frequency loss that builds over years. Sudden sensorineural hearing loss (SSHL), also called sudden deafness, is a medical emergency. Treatment timing matters. This page explains what SSHL is, why it is urgent, how it is diagnosed, what NIDCD and AAO-HNS clinical practice guidelines say about next steps, and when hearing aids may enter the picture after medical evaluation.
What is sudden hearing loss? The direct answer
What is sudden hearing loss? Sudden sensorineural hearing loss (SSHL), also called sudden deafness, is an unexplained rapid loss of hearing all at once or over a few days. According to the National Institute on Deafness and Other Communication Disorders (NIDCD, last updated September 14, 2018), SSHL is typically an inner-ear (sensorineural) problem, often affects one ear, and is diagnosed when a person loses at least 30 dB of hearing in three contiguous frequencies within 72 hours. It is not the same as gradual age-related hearing loss. SSHL is a medical emergency and should be evaluated promptly because treatment effectiveness depends heavily on how soon care begins.
The American Academy of Otolaryngology-Head and Neck Surgery Foundation (AAO-HNSF) published an updated Clinical Practice Guideline: Sudden Hearing Loss in August 2019. The guideline emphasizes prompt audiometric evaluation (within 14 days of onset, sooner if possible) and timely treatment (within 2 weeks of onset) for adult patients with sudden hearing loss. Epidemiology cited in AAO-HNSF materials notes that SSHL affects approximately 5 to 27 per 100,000 people annually, with roughly 66,000 new U.S. cases each year.
If your hearing drops noticeably in one ear over hours or days, do not wait to see if it resolves. Do not buy an amplification device. Seek medical care immediately. Timing is critical.
Why sudden hearing loss is an emergency (timing window)
NIDCD is explicit: sudden deafness should be treated as a medical emergency, and delaying diagnosis and treatment can decrease the effectiveness of treatment. The window for potential recovery is time-sensitive. While about half of people with SSHL experience some spontaneous recovery (often within 1 to 2 weeks), you cannot predict whether you will be in that half, and early medical intervention may improve the odds of recovery and minimize permanent loss.
AAO-HNSF 2019 guidelines (Key Action Statement 8) describe offering corticosteroids as initial therapy within 2 weeks of symptom onset as an option. The guideline notes that earlier treatment is generally associated with better outcomes. NIDCD-supported research published in 2011 showed that intratympanic steroid injection was as effective as oral steroids, and noted that starting steroid treatment as soon as possible is important. Delaying treatment more than 2 to 4 weeks may reduce the likelihood of reversing or minimizing permanent hearing loss.
Key timing benchmarks:
- 72 hours: The clinical definition of SSHL uses 72 hours as the window for diagnosing the loss (at least 30 dB in three contiguous frequencies within 72 hours). Aim for evaluation within this window if possible.
- Within days: AAO-HNSF recommends audiometry as soon as possible, ideally within 14 days of symptom onset.
- Within 2 weeks: AAO-HNSF guidelines describe initiating corticosteroid treatment within 2 weeks of onset. Earlier is better.
- 2 to 4 weeks is late: NIDCD notes that delaying treatment more than 2 to 4 weeks from onset decreases the likelihood of recovery.
Not gradual hearing loss?
For early gradual signs (trouble in restaurants, asking people to repeat, TV volume), see our 10 early signs of hearing loss guide. Sudden loss is a separate emergency.
Symptoms and how people first notice sudden hearing loss
NIDCD describes how people often notice SSHL:
- Waking up deaf in one ear. Many people discover the loss when they wake up in the morning.
- Using a phone. Holding the phone to the affected ear reveals that sound is gone or muffled on that side.
- A loud "pop" before the hearing disappears. Some people report hearing a loud popping sound immediately before the hearing loss occurs.
Accompanying symptoms may include:
- Tinnitus (ringing, buzzing, hissing). About 90 percent of people with SSHL also experience tinnitus, according to NIDCD.
- A feeling of fullness or pressure in the ear. Often described as the ear feeling "plugged" or "blocked."
- Dizziness or vertigo. About half of people with SSHL experience dizziness, and about 30 percent have vertigo.
These symptoms can mimic earwax blockage, middle ear fluid, or sinus congestion, which is one reason many people delay seeking care. But sudden sensorineural hearing loss is an inner-ear emergency, not a wax or congestion issue that will resolve on its own. If you are unsure whether your sudden hearing change is SSHL or another cause, see a physician or audiologist immediately. The evaluation will distinguish conductive causes (wax, fluid) from sensorineural loss.
What causes sudden sensorineural hearing loss? (NIDCD: ~10% identifiable)
NIDCD states that only about 10 to 15 percent of people diagnosed with SSHL have an identifiable cause. In the remaining 85 to 90 percent of cases, the cause is unknown (idiopathic SSHL). This is why prompt evaluation and treatment focus on ruling out serious causes and managing the hearing loss itself, even when no specific cause is found.
Identifiable causes of SSHL include:
- Infections. Viral infections such as measles, mumps, meningitis, and HIV have been associated with SSHL. Other infections affecting the inner ear may also cause sudden hearing loss.
- Head trauma. Injury to the head or ear, including barotrauma (rapid pressure changes, such as during scuba diving or air travel), can damage the inner ear.
- Autoimmune diseases. Conditions in which the immune system attacks the body's own tissues can affect the inner ear. Autoimmune inner ear disease may cause sudden or rapidly progressive hearing loss in one or both ears.
- Ototoxic medications. Certain drugs can damage the inner ear and cause sudden hearing loss. These include some antibiotics (aminoglycosides like gentamicin), chemotherapy agents (cisplatin), high doses of aspirin, loop diuretics, and other medications. If you started a new medication shortly before the hearing loss, tell your doctor.
- Circulation problems. Blood clots, cardiovascular disease, and diabetes can affect blood flow to the inner ear, potentially causing SSHL.
- Neurological disorders. Multiple sclerosis (MS) and other neurological conditions can cause sudden hearing loss.
- Meniere's disease. A disorder of the inner ear that causes episodes of vertigo, tinnitus, hearing loss, and a feeling of fullness in the ear. Hearing loss in Meniere's may be sudden or progressive.
- Tumors of the auditory nerve. When SSHL is unilateral (one ear only), clinicians must rule out acoustic neuroma (vestibular schwannoma) or other retrocochlear pathology. This is one reason why imaging (MRI or auditory brainstem response testing) is part of the evaluation for sudden one-sided hearing loss.
| Cause category | Examples | Prevalence in SSHL |
|---|---|---|
| Idiopathic (unknown) | No identifiable cause found | ~85 to 90% |
| Infections | Viral (measles, mumps, meningitis, HIV), bacterial | ~10 to 15% combined |
| Trauma | Head injury, barotrauma | |
| Autoimmune | Autoimmune inner ear disease | |
| Ototoxic drugs | Aminoglycosides, cisplatin, high-dose aspirin | |
| Circulatory | Blood clots, cardiovascular disease, diabetes | |
| Neurological | MS, other CNS disorders | |
| Tumors | Acoustic neuroma (when unilateral) |
How clinicians diagnose sudden hearing loss
AAO-HNSF 2019 guidelines describe a structured diagnostic approach. The goal is to confirm the hearing loss, distinguish sensorineural from conductive loss, and rule out serious underlying causes.
Step 1: Rule out conductive causes (KAS1)
AAO-HNSF Key Action Statement 1 (strong recommendation): clinicians should distinguish sensorineural hearing loss from conductive hearing loss at the time of first clinical presentation. A physical exam can identify earwax blockage, middle ear fluid, eardrum perforation, or other conductive problems. Tuning fork tests (Weber and Rinne) help distinguish sensorineural from conductive loss at the bedside.
Step 2: Pure-tone audiometry as soon as possible (KAS4)
AAO-HNSF KAS4: clinicians should obtain audiometry as soon as possible, and within 14 days of symptom onset, in patients presenting with sudden hearing loss who do not have an obvious, medically treatable cause (such as cerumen impaction or middle ear effusion). Pure-tone audiometry confirms the hearing loss pattern, quantifies the degree of loss, and documents the baseline for monitoring recovery.
NIDCD notes that the clinical definition of SSHL is a sensorineural hearing loss of at least 30 dB in three contiguous frequencies occurring within 72 hours. Audiometry provides the objective data to confirm this definition.
Step 3: Evaluate for retrocochlear pathology (KAS6)
AAO-HNSF KAS6: clinicians should evaluate patients with sudden hearing loss for retrocochlear pathology by obtaining MRI or auditory brainstem response (ABR) testing. If MRI cannot be performed, CT may be used, though MRI is preferred. This step is critical for ruling out acoustic neuroma or other tumors, especially when hearing loss is unilateral. Retrocochlear pathology can present as sudden hearing loss, and missing a tumor can have serious consequences.
Step 4: Blood tests and balance evaluation as indicated
NIDCD describes further testing that may include blood work to check for infections, autoimmune markers, metabolic conditions (diabetes, thyroid), and cardiovascular risk factors. If dizziness or vertigo is present, balance (vestibular) testing may be performed to evaluate inner ear function.
What guidelines say about next steps (not medical advice, not dosing instructions)
This section summarizes what NIDCD and AAO-HNSF clinical practice guidelines say about treatment options for SSHL. It is not medical advice, not a treatment protocol, and does not prescribe doses or self-treatment. Always follow your physician's guidance. If you have sudden hearing loss, seek medical care immediately.
Corticosteroids as initial therapy (AAO-HNSF KAS8)
AAO-HNSF KAS8 (option): clinicians may offer corticosteroids as initial therapy to patients with idiopathic sudden sensorineural hearing loss within 2 weeks of symptom onset. Corticosteroids (oral or intratympanic injection) are the most common treatment for SSHL when no specific cause is identified. The guideline notes that earlier treatment is generally associated with better outcomes.
NIDCD notes that a 2011 NIDCD-supported clinical trial showed that intratympanic (directly into the middle ear) steroid injection was as effective as oral steroids for SSHL. The study emphasized that treatment should begin as soon as possible, and that delaying treatment more than 2 to 4 weeks from onset makes it less likely that treatment will reverse or reduce permanent hearing loss.
Timing is critical. Steroids are most effective when started early. Do not wait to see if hearing returns on its own. Seek evaluation immediately so that treatment can be initiated within the optimal window.
Hyperbaric oxygen therapy (AAO-HNSF KAS9a, KAS9b)
AAO-HNSF KAS9a and KAS9b (option): clinicians may offer hyperbaric oxygen therapy (HBOT) in combination with corticosteroids as initial treatment (within 2 weeks of onset) or as salvage therapy (within 1 month of onset, typically for patients with incomplete recovery from initial treatment). HBOT is not universally available and is typically reserved for severe cases or those not responding to steroids alone.
Intratympanic steroids for incomplete recovery (AAO-HNSF KAS10)
AAO-HNSF KAS10 (option): clinicians may offer intratympanic steroid perfusion when patients have incomplete recovery from sudden hearing loss 2 to 6 weeks after onset. This is a salvage option for patients who did not fully recover with initial oral steroid treatment.
Follow-up audiometry (AAO-HNSF KAS12)
AAO-HNSF KAS12: clinicians should obtain follow-up audiometry at the conclusion of treatment for sudden hearing loss and, if the hearing loss persists, within 6 months. Follow-up testing monitors recovery, documents final hearing levels, and provides a baseline for future comparison.
This page summarizes NIDCD and AAO-HNSF guideline language for patient education. It is not a treatment recommendation, not a prescription, and not a substitute for prompt medical evaluation. If you have sudden hearing loss, seek medical care immediately. Your physician will determine the appropriate evaluation and treatment for your specific case.
After recovery or residual loss: when hearing aids may help
NIDCD notes that about half of people with SSHL experience some spontaneous recovery of hearing, often within 1 to 2 weeks. Some people recover fully, some recover partially, and some do not recover at all. The outcome varies widely and is not reliably predictable at the time of diagnosis. Early treatment may improve the odds of recovery, but even with treatment, some people are left with permanent residual hearing loss.
AAO-HNSF KAS13: clinicians should offer audiologic rehabilitation to patients with incomplete recovery from sudden hearing loss who have residual hearing loss and/or tinnitus. Audiologic rehabilitation may include hearing aids, assistive listening devices, communication strategies training, and tinnitus management.
Hearing aids are not a treatment for acute sudden hearing loss. They are a management option for residual hearing loss after the acute phase has passed and hearing has stabilized. Your audiologist or ENT will guide you on when amplification is appropriate. For guidance on when to see an ENT versus an audiologist, see our audiologist vs. ENT comparison.
Where hearing aids fit (soft product context, only after medical evaluation)
If you have been medically evaluated for sudden hearing loss, have completed treatment, and have persistent residual hearing loss, hearing aids may help you manage that loss. Amplification does not reverse the loss or treat the underlying cause. It amplifies sound to help you hear better with the hearing you have left.
The FDA lists sudden or rapidly progressive hearing loss in one or both ears within the past 90 days as a red-flag condition requiring medical evaluation before using hearing aids. This applies to both prescription hearing aids and over-the-counter (OTC) devices. For more on FDA red flags and OTC versus prescription rules, see our OTC vs. prescription hearing aids guide.
When you are ready to explore hearing aids for residual loss after medical care, use the decision framework in our how to choose hearing aids guide to match device type, features, and budget to your hearing loss and lifestyle. Browse styles and brands in the hearing aid catalog. We do not publish per-model clinic prices, star ratings, or best-of lists here. This page is emergency guidance, not a shopping guide.
After medical evaluation, if residual loss remains
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Frequently asked questions
What is sudden hearing loss / sudden deafness? +
Sudden sensorineural hearing loss (SSHL), also called sudden deafness, is an unexplained rapid loss of hearing all at once or over a few days. NIDCD defines SSHL as a loss of at least 30 dB in three contiguous frequencies within 72 hours. It usually affects one ear, though it can be bilateral. It is not the same as gradual age-related hearing loss. SSHL is a medical emergency and should be evaluated promptly.
Is sudden hearing loss in one ear an emergency? +
Yes. Sudden hearing loss in one ear (unilateral SSHL) is a medical emergency. NIDCD states that sudden deafness should be treated as a medical emergency, and delaying diagnosis and treatment can decrease effectiveness. AAO-HNS 2019 guidelines emphasize prompt evaluation and treatment within 2 weeks of onset, with earlier intervention generally better. If your hearing drops noticeably in one ear over hours or days, seek medical care immediately, ideally within 72 hours.
What causes sudden sensorineural hearing loss? +
In about 90% of SSHL cases, the cause is never identified (idiopathic). NIDCD notes that only about 10 to 15 percent of SSHL cases have an identifiable cause. Known causes include viral infections (measles, mumps, meningitis, HIV), head trauma, autoimmune diseases, ototoxic medications (certain antibiotics, chemotherapy drugs, high-dose aspirin), circulatory problems (blood clot, cardiovascular disease, diabetes), neurological disorders (multiple sclerosis), and Meniere's disease. When SSHL is unilateral, clinicians rule out acoustic neuroma and other tumors of the auditory nerve.
How is SSHL diagnosed? +
Diagnosis starts with ruling out conductive causes like earwax or fluid. Pure-tone audiometry should be performed within a few days of symptom onset to confirm the hearing loss pattern. AAO-HNS 2019 guidelines recommend audiometry as soon as possible, within 14 days of onset. The clinical definition of SSHL is a sensorineural hearing loss of at least 30 dB in three contiguous frequencies within 72 hours. Further evaluation may include blood tests, MRI or auditory brainstem response (ABR) to rule out retrocochlear pathology (tumors), and balance testing if dizziness is present.
How soon should I see a doctor for sudden hearing loss? +
Immediately. NIDCD says sudden deafness should be treated as a medical emergency and that delaying diagnosis and treatment can decrease effectiveness. Aim for evaluation within 72 hours if possible. AAO-HNS guidelines emphasize treatment within 2 weeks of onset, but earlier is better. The window for potential recovery is time-sensitive. Do not wait to see if it resolves on its own.
Can sudden hearing loss recover on its own? +
About half of people with SSHL recover some or all of their hearing spontaneously, often within 1 to 2 weeks, according to NIDCD. However, you should still seek prompt medical care, because treatment may improve the odds of recovery and because some cases do not recover. Delaying evaluation can reduce the chance of reversing or minimizing permanent loss. Even if spontaneous recovery occurs, medical evaluation is important to rule out serious underlying causes.
Should I buy a hearing aid or OTC device first for sudden hearing loss? +
No. Sudden hearing loss is a medical emergency, not a gradual change that you manage with amplification. FDA red-flag conditions include sudden or rapidly progressive hearing loss in one or both ears within the past 90 days. Do not self-treat with hearing aids or OTC devices during acute sudden loss. Seek medical care immediately. Hearing aids may be appropriate later if hearing does not fully recover and you have residual loss after medical evaluation and treatment.
When do hearing aids come into the picture after SSHL? +
Only after medical evaluation, treatment, and stabilization. If hearing does not fully recover after SSHL and you have persistent residual loss, AAO-HNS guidelines (KAS13) recommend audiologic rehabilitation for residual hearing loss and/or tinnitus. That may include hearing aids, assistive listening devices, communication strategies, and tinnitus management. Your audiologist or ENT will guide you on when amplification is appropriate, typically after the treatment window has closed and your hearing has stabilized.
Managing residual loss after SSHL medical care?
If hearing has stabilized and you are ready to explore hearing aids, see what licensed clinics near you charge for prescription devices and audiologic rehabilitation services.
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Sources
- National Institute on Deafness and Other Communication Disorders (NIDCD), Sudden Deafness (Sudden Sensorineural Hearing Loss). NIH Pub. No. 00-4757, March 2018; page last updated September 14, 2018. Accessed October 5, 2026.
- American Academy of Otolaryngology-Head and Neck Surgery Foundation (AAO-HNSF), Chandrasekhar SS, et al., Clinical Practice Guideline: Sudden Hearing Loss (Update). Otolaryngology-Head and Neck Surgery, August 1, 2019. PubMed PMID 31369359. Accessed October 5, 2026.
- American Academy of Otolaryngology-Head and Neck Surgery Foundation, Clinical Practice Guideline: Sudden Hearing Loss (Update), August 2019. Accessed October 5, 2026.
- American Academy of Otolaryngology-Head and Neck Surgery Foundation, AAO-HNSF Updated CPG: Sudden Hearing Loss - Press Release & Fact Sheet, 2019. Accessed October 5, 2026.
- U.S. Food and Drug Administration, Hearing Aids (Consumer Products). Red-flag conditions requiring medical evaluation (includes sudden or rapidly progressive hearing loss within 90 days). Accessed October 5, 2026.
- U.S. Food and Drug Administration, How to Get Hearing Aids. Consumer guidance on when to see a physician before using hearing aids. Accessed October 5, 2026.