Disclaimer: This is general health information only and is not a substitute for advice from your GP or healthcare professional. Sudden hearing loss is a medical emergency and requires urgent assessment.
1. What is sudden sensorineural hearing loss?
Sudden sensorineural hearing loss is a rapid loss of hearing, usually in one ear, that develops over a few hours or up to three days. It occurs due to damage to the inner ear or auditory nerve and is considered an otological emergency.
2. Why is sudden SNHL an emergency?
Sudden SNHL is time-sensitive because early treatment significantly improves the chance of hearing recovery. Delayed assessment and management may result in permanent hearing loss. Prompt medical review is strongly recommended.
3. What are the common symptoms?
Symptoms include sudden muffled or reduced hearing in one ear, a sensation of ear fullness, tinnitus such as ringing or buzzing, and sometimes dizziness or imbalance. Many people notice it upon waking or while using the phone on one side.
4. How is sudden SNHL different from a blocked ear?
A blocked ear from wax or congestion usually causes a gradual sensation of fullness without true nerve-related hearing loss. Sudden SNHL often presents with an abrupt drop in hearing clarity and may be accompanied by tinnitus or vertigo. A healthcare professional can perform simple tests to differentiate between conductive and sensorineural causes.
5. What causes sudden SNHL?
In many cases, the exact cause is unknown. Possible causes include viral infections, inflammation, autoimmune conditions, vascular compromise to the inner ear, or rarely, tumours affecting the auditory nerve.
6. What should I do if I suspect sudden SNHL?
Seek urgent medical attention on the same day, either through your GP, an emergency department, or an ear, nose and throat specialist. Early evaluation is critical to confirm the diagnosis and initiate treatment promptly.
7. How is sudden SNHL diagnosed?
Diagnosis involves a clinical history, ear examination, and urgent hearing tests such as pure-tone audiometry. If confirmed, further investigations such as MRI may be arranged to exclude structural causes affecting the auditory nerve.
8. What is the standard treatment?
The main treatment is corticosteroid therapy, either taken orally or administered directly into the middle ear via injection. Treatment is most effective when started within the first two weeks of symptom onset.
9. Can hearing recover after sudden SNHL?
Some patients experience partial or complete recovery, especially with early treatment. Others may have persistent hearing loss despite therapy. The degree of recovery varies depending on severity and how quickly treatment is started.
10. What are the possible long-term effects?
If recovery is incomplete, individuals may experience permanent hearing loss, ongoing tinnitus, or balance difficulties. Hearing aids or other assistive devices may be required to improve communication and quality of life. Early recognition and urgent management provide the best chance of recovery.