Sudden Hearing Loss: What to Do in the First 72 Hours

Sudden hearing loss is one of the few true ear emergencies. You wake up one morning and one ear is muffled, blocked, or completely silent — where it was perfectly normal the night before. Or the loss happens in an instant, sometimes with a loud pop and immediate ringing. The first instinct for most people is to wait and see, assuming it will pass like a blocked ear from a cold. This is a critical mistake. Sudden sensorineural hearing loss (SSHL) is a medical emergency that requires diagnosis and treatment — ideally within 24 to 72 hours of onset — to maximize the chance of meaningful recovery. Every hour of delay matters. This guide explains what to do immediately, why speed is essential, and what treatment options are available in India.

Sudden sensorineural hearing loss (SSHL) — often called "sudden deafness" — is defined medically as a loss of 30 decibels (dB) or more across at least 3 consecutive audiometric frequencies, occurring within 72 hours. It typically affects one ear, though bilateral cases do occur.

In most cases, the person goes to bed hearing normally and wakes up with significant hearing loss in one ear, sometimes also experiencing:

• A feeling of fullness or pressure in the affected ear
• Tinnitus (ringing, buzzing, hissing) in the affected ear
• Dizziness or vertigo
• A sensation that sounds are distorted or muffled

SSHL affects approximately 5–20 people per 100,000 per year globally. In India, the exact prevalence is not well documented, but the condition is far more common than most people — and some general physicians — realise.

Yes — without question.

Time to treatment is the single most important factor determining recovery in SSHL. Clinical evidence consistently shows:

• Patients treated within 24 hours of onset have significantly better recovery rates than those treated later
• After 2–4 weeks without treatment, the window for meaningful recovery largely closes
• After 3 months, the hearing loss is typically considered permanent

Do not wait to see if it resolves on its own. Do not assume it is a wax blockage, a cold, or fluid from swimming. Do not take antihistamines and hope for improvement. Go to an ENT specialist or emergency department immediately — the same day if possible.

In approximately 85–90% of SSHL cases, no definitive cause is identified — these are classified as idiopathic SSHL. The most commonly theorized and identified causes include:

Known and Suspected Causes

• Viral infection affecting the cochlea or auditory nerve — herpes viruses (HSV, VZV), influenza, cytomegalovirus are the most commonly implicated
• Vascular events — sudden reduction in blood supply to the inner ear (the cochlea is exquisitely sensitive to ischemia)
• Autoimmune inner ear disease — the immune system attacks cochlear structures
• Perilymph fistula — a tear in the thin membrane separating the inner and middle ear, often from exertion, straining, or barotrauma
• Acoustic neuroma (vestibular schwannoma) — a benign tumor on the auditory nerve; rare, but must be ruled out with imaging
• Ototoxic medications — certain aminoglycoside antibiotics, cisplatin and other chemotherapy agents, high-dose aspirin or NSAIDs
• Barotrauma — rapid pressure changes from scuba diving, air travel, or forceful nose blowing
• Meniere's disease — an inner ear disorder causing episodic hearing loss, tinnitus, and vertigo
• COVID-19 — growing evidence links SARS-CoV-2 infection to SSHL through direct cochlear damage and vascular effects

Seek emergency care immediately if you experience:

• Hearing loss in one or both ears appearing suddenly — overnight or within minutes to hours
• Muffled or distorted sound quality in the affected ear
• Sudden new tinnitus (ringing, buzzing, hissing) in one ear
• Feeling of fullness or pressure in the ear without a cold or sinus problem
• Dizziness, loss of balance, or vertigo accompanying the hearing change

If you experience any combination of these symptoms, do not wait for them to resolve — they may not, and waiting reduces your chances of recovery.

This is the most critical window. Every hour of delay reduces recovery probability.

Step 1 — Recognize it as an emergency. Do not wait more than 24 hours. Sudden hearing loss should be treated with the same urgency as chest pain or a sudden visual disturbance.

Step 2 — Go to an ENT specialist or hospital emergency department. Your first stop should be an ENT (otolaryngologist) — not a general physician, not a pharmacist. Tell the doctor clearly: "I have sudden hearing loss in my left/right ear. It came on this morning / overnight / today."

Step 3 — Expect an audiogram. The ENT will order a pure tone audiogram to measure the extent and pattern of your hearing loss. This is the definitive diagnostic test for SSHL.

Step 4 — Rule out simple causes. The doctor will examine your ear canal for wax blockage, inspect the eardrum for infection or fluid, and check for other obvious conductive causes. Blood tests and imaging may be ordered.

Step 5 — Begin treatment promptly. If SSHL is confirmed and no obvious reversible cause is found, treatment — typically high-dose oral corticosteroids — should begin the same day or the next day at the latest.

• Do NOT assume it will resolve on its own and wait several days before seeking care
• Do NOT take antihistamines, nasal decongestants, or ear drops as a first response
• Do NOT attempt to "clear" your ear by inserting cotton buds or other objects
• Do NOT delay beyond 24–48 hours before seeing a doctor
• Do NOT accept a diagnosis of "wax buildup" without the doctor actually visualizing wax in the canal — wax alone does not typically cause sudden, severe unilateral hearing loss
• Do NOT self-diagnose as "blocked ear from a flight" — barotrauma and sudden SSHL can look similar but require different treatments

The ENT will conduct a comprehensive evaluation to confirm SSHL and rule out treatable causes.

Tests for Sudden Hearing Loss

• Pure tone audiometry (PTA): Maps hearing thresholds across frequencies — the primary diagnostic test
• Speech discrimination test: Measures how well you understand spoken words in the affected ear
• Tympanometry: Checks middle ear pressure and eardrum mobility, ruling out conductive causes
• Otoacoustic emissions (OAE): Assesses cochlear hair cell function
• MRI with gadolinium contrast: Ordered when unusual patterns are present or acoustic neuroma must be ruled out — typically performed after initial treatment begins
• Blood tests: Complete blood count, lipid panel, coagulation studies, autoimmune markers, viral titres (HSV, CMV), blood glucose

Systemic Corticosteroids (First-Line Treatment)

High-dose oral prednisolone (typically 1 mg/kg/day for 10–14 days, then tapered) is the standard first-line treatment for idiopathic SSHL. Corticosteroids reduce cochlear inflammation and edema and may improve cochlear blood supply. Evidence for benefit is strongest when treatment begins within 72 hours of onset.

Intratympanic Steroid Injection

For patients who cannot safely take systemic steroids — those with uncontrolled diabetes, hypertension, active peptic ulcer, or psychiatric conditions — or who do not respond adequately to oral steroids, intratympanic dexamethasone injection is an effective alternative or add-on. The corticosteroid is injected directly into the middle ear through the eardrum and diffuses into the cochlea through the round window membrane. This procedure is available at major ENT departments and tertiary hospitals across India.

Hyperbaric Oxygen Therapy (HBOT)

HBOT involves breathing pure oxygen in a pressurized chamber, dramatically increasing oxygen delivery to inner ear tissues. Evidence supports its use for SSHL, particularly within the first 2–4 weeks, as an adjunct to steroid therapy. Availability in India is limited to major cities (Mumbai, Delhi, Bangalore, Hyderabad, Chennai) but is growing.

Treatment of Identified Underlying Causes

When a specific cause is found — autoimmune disease, Meniere's, viral infection, vascular cause — targeted treatment is initiated alongside or in place of steroids. An acoustic neuroma, if confirmed, is managed by a multidisciplinary team including neurology and neurosurgery.

SSHL outcomes are highly variable:

• Approximately 32–65% of patients experience spontaneous partial recovery without treatment
• Treatment with corticosteroids improves the recovery rate, particularly for moderate-to-severe losses
• Complete recovery (return to pre-SSHL thresholds) occurs in approximately 25–30% of treated patients
• Partial recovery (significant improvement but not full recovery) occurs in an additional 30–40%
• No meaningful recovery occurs in approximately 30–35% of cases despite treatment

Prognosis is better when:

• Treatment begins early — within 72 hours of onset
• The initial hearing loss is less severe (mild-moderate rather than severe-profound)
• The patient is younger
• No vertigo or dizziness is present alongside the hearing loss
• The audiogram shows a low-frequency or ascending pattern rather than a flat or high-frequency loss

For patients who do not recover fully, hearing aids may be recommended once:

• The hearing loss has stabilized — typically assessed 3 months after onset
• Medical treatment has been completed
• The treating ENT or audiologist confirms no further meaningful recovery is expected

Patients with permanent single-sided deafness (SSD) from SSHL have specific hearing solutions available, including:

• CROS hearing aids — microphone on the deaf side, receiver on the good ear
• BiCROS aids — for patients with some loss in both ears
• Bone-anchored hearing aids (BAHA) — surgically placed devices that conduct sound through the skull to the functioning cochlea
• Cochlear implants — for bilateral profound loss cases

Understanding your hearing loss symptoms and options is the first step toward finding the right long-term solution.

Q1: Can sudden hearing loss come back after recovery?

In some cases, yes — particularly when the underlying cause is autoimmune inner ear disease or Meniere's disease. These conditions can cause recurrent episodes. Your ENT will advise on monitoring protocols and preventive treatment if a recurrent cause is identified.

Q2: Is sudden hearing loss always in one ear?

The vast majority of SSHL cases (approximately 98%) are unilateral (one ear). Bilateral simultaneous SSHL is rare and often signals a systemic cause — autoimmune disease, bilateral acoustic neuroma, or ototoxic medication exposure — requiring urgent further investigation.

Q3: Can COVID-19 cause sudden hearing loss?

Yes. A growing body of evidence links SARS-CoV-2 infection to SSHL, likely through direct cochlear damage and vascular effects. If you develop sudden hearing loss during or in the weeks following COVID-19 illness, mention it explicitly to your ENT — it is relevant to diagnosis and treatment decisions.

Q4: How is sudden hearing loss different from a wax blockage?

Wax blockage causes a gradual, typically mild reduction in hearing that often follows water entering the ear. SSHL is sudden, often severe, usually unilateral, and frequently accompanied by tinnitus. A doctor can distinguish between them within seconds with an otoscope and audiogram. Never assume sudden hearing change is wax without proper examination.

Q5: Should I go to the emergency department or book an ENT appointment?

If the hearing loss occurred within the last 24 hours — go to an emergency department immediately. Do not wait for an appointment slot. If the loss occurred 1–3 days ago, contact an ENT clinic and request the most urgent appointment available, explaining it is sudden hearing loss. Do not book a routine slot 2–3 weeks away.

Sudden hearing loss is a medical emergency. The most important message from this article is simple: do not wait. If you or someone you know loses hearing suddenly in one ear, go to an ENT specialist or emergency department within 24 hours. The treatment window for SSHL is narrow, and every hour matters. With prompt diagnosis and treatment, many patients recover meaningful hearing. Without it, that opportunity closes and may not reopen.

If you have experienced hearing loss — sudden or gradual — and need a comprehensive evaluation and expert guidance on next steps, book a consultation at HearCure's audiologist consultation today.

• https://www.hearcure.in/type/hearing-loss/hearing-loss-causes-symptoms-and-early-signs-complete-guide
• https://www.hearcure.in/audiologist-consultation
• https://en.wikipedia.org/wiki/Sudden_sensorineural_hearing_loss
• https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5414567/
• https://www.nidcd.nih.gov/health/sudden-deafness
• https://www.aaohns.org/clinical-practice/clinical-practice-guidelines/sudden-hearing-loss