Direct answer
Sudden hearing loss in one ear is an urgent symptom. It may result from wax or middle-ear fluid, but it may also be sudden sensorineural hearing loss (SSNHL) arising in the inner ear. These cannot be reliably distinguished at home. Do not wait or self-medicate: seek same-day assessment and prompt audiometry so time-sensitive treatment options are not missed.
Symptoms
- Suddenly muffled or distorted hearing in one ear
- A full or blocked sensation
- New tinnitus or ringing
- Dizziness, imbalance or nausea
- A marked difference when moving a phone between ears
Possible causes
- No specific cause is identified in many cases
- Viral or other infection and inner-ear inflammation
- Autoimmune disease
- Head trauma or ototoxic medication exposure
- Circulatory or neurological disorders
- Ménière’s disease or uncommon auditory-nerve/retrocochlear disease
How it is assessed
- Clarify exact onset, one or both ears, and associated tinnitus, vertigo or neurological symptoms
- Perform otoscopy and selected tuning-fork tests to look for wax, fluid, perforation or another conductive cause
- Use pure-tone audiometry within days to confirm and grade sensorineural loss
- Consider MRI or auditory-pathway evaluation for unilateral SSNHL when appropriate
Treatment options
- After confirmation, a clinician may offer corticosteroids within two weeks of onset after considering contraindications and individual risk
- Intratympanic steroid may be considered when oral treatment is unsuitable or according to the clinical context
- For incomplete recovery, guideline-supported salvage intratympanic steroid treatment may be offered two to six weeks after onset
- Treat an identified infection, autoimmune disorder or other cause specifically
- For permanent loss, consider hearing aids, rehabilitation or selected cochlear-implant assessment
When to seek emergency care
- Facial droop, limb weakness/numbness or slurred speech
- Double vision, inability to walk or a new severe headache
- Hearing loss after head injury, ear bleeding or clear fluid
- Sudden loss affecting both ears
- Severe vertigo, repeated vomiting or rapid deterioration
At a glance
Definition: A rapid reduction in hearing over hours to a few days—often with fullness, tinnitus or dizziness—should not be assumed to be wax or a cold. It may be sudden sensorineural hearing loss (SSNHL), which needs prompt ENT assessment and a hearing test.
Key takeaways
- A sudden drop in hearing in one or both ears
- A blocked or full sensation in the ear
- New tinnitus, dizziness or imbalance
- A clear difference noticed on waking or while using the telephone
Clinical steps
- First exclude conductive causes such as wax, middle-ear fluid or infection
- Arrange pure-tone audiometry promptly to define the type and degree of loss
- Use MRI or other targeted tests when clinically indicated
- Discuss steroid treatment through shared decision-making, considering timing, risks and contraindications
Red flags: Seek same-day urgent ENT or hospital assessment for sudden hearing loss. Go directly to emergency care if it occurs with facial droop, arm or leg weakness/numbness, slurred speech, double vision or a new severe headache.
How I assess this in clinic
I first clarify duration, severity, whether symptoms are one-sided or bilateral, and their effect on daily life. I then perform a focused ENT examination and compare the findings with a sudden drop in hearing in one or both ears.
Endoscopy or audiometry is not required for everyone. I advise endoscopy when the nose, sinus, throat or voice box needs direct assessment, and audiometry/tympanometry when hearing or middle-ear function is in question.
A common misconception is that every ENT problem needs an antibiotic or an operation. Treatment should instead follow the diagnosis, functional impact, examination findings and evidence-based indications.
Do not wait when: Seek same-day urgent ENT or hospital assessment for sudden hearing loss. Go directly to emergency care if it occurs with facial droop, arm or leg weakness/numbness, slurred speech, double vision or a new severe headache.
Frequently asked questions
Is a suddenly blocked ear always caused by wax?+
No. Wax is possible, but the sensation alone cannot distinguish wax, middle-ear fluid and inner-ear hearing loss. Otoscopy and audiometry are needed.
How quickly should I seek medical care?+
Arrange same-day or the earliest possible urgent ENT or hospital assessment. Prompt diagnosis preserves the opportunity to consider time-sensitive treatment.
Should I start steroids myself?+
No. Contraindications, dose, route and potential adverse effects vary. Steroids should only follow an appropriate clinical assessment.
Why is audiometry important?+
It documents whether the loss is conductive or sensorineural, which frequencies are affected and its severity, guiding diagnosis and follow-up.
Does everyone need an MRI?+
No. A clinician may consider MRI in unilateral SSNHL or when there is concern about the auditory nerve or another retrocochlear cause.
Will hearing fully recover?+
Recovery varies with the individual and severity. Some improve spontaneously, but recovery is not guaranteed and delayed treatment may be less effective.
Related ENT services
Ear ConditionsAssessment of ear pain, infection, eardrum perforation, tinnitus, cholesteatoma and hearing loss.→Hearing TestsAge- and symptom-appropriate tests help identify the type and degree of hearing loss.→Hearing AidsHearing-aid selection and follow-up based on reliable testing, individual needs, budget and listening environments.→For patient education; not a substitute for individual diagnosis or treatment. Seek emergency care for red-flag symptoms.