Introduction
It is a sensation almost everyone has experienced: a feeling of fullness, muffled sound, or the annoyance of one ear feeling like it is underwater. For the vast majority of people, the culprit is mundane—usually a build-up of earwax or temporary congestion from a cold. Because of this, the natural human response is to take a “wait and see” approach.
However, as audiologists, this “wait and see” approach is our biggest concern.
There is a medical condition that mimics a simple blocked ear but carries a much higher risk. It is called Sudden Sensorineural Hearing Loss (SSHL), often referred to as “ear stroke.” The difference between a simple cleaning and a medical emergency often comes down to a matter of hours, not weeks.
It happens more often than you think
You wake up one morning, or perhaps you step out of the shower, and realize one of your ears feels completely blocked. Sounds are muffled, distinct voices sound like mumbling, and there is a sensation of fullness or pressure.
Your first thought is likely, “It’s just earwax. I’ll buy some drops or wait for it to clear.”
While impacted earwax is indeed the most common cause of blocked ears, assuming it is the only cause can be a risky gamble. Here is how to tell the difference.
Scenario A: Impacted Earwax (Conductive Loss)
Earwax (cerumen) is healthy and necessary, but sometimes it builds up and blocks the ear canal. This creates a physical barrier that stops sound from traveling to the eardrum.
The Signs it might be Earwax:
- The onset was gradual: You may have noticed your hearing slightly declining over a few days or weeks before it finally "closed up."
- Water trigger: It often happens after swimming or showering, as water causes existing wax to swell and fill the gap.
- It fluctuates: Chewing, yawning, or pulling on your earlobe might momentarily change the sound or relieve pressure.
- No dizziness: Usually, a wax blockage is annoying but doesn't make the room spin.
Scenario B: Sudden Sensorineural Hearing Loss (The Emergency)
SSHL is a rapid loss of hearing caused by damage to the inner ear (cochlea) or the nerve pathways. It is often idiopathic (unknown cause), though it can be linked to viral infections or circulation issues.
The Signs it might be SSHL:
- Instant onset: The hearing loss happened instantly (like a switch flipping) or over a period of just a few hours.
- The "Pop": Some patients report hearing a loud "pop" right before the hearing disappeared.
- Loud Tinnitus: A sudden, high-pitched ringing or roaring sound in the affected ear is a major red flag.
- Vertigo: You may feel dizzy or off-balance.
- The "Cotton Wool" feeling: The ear feels numb or stuffed with cotton, and wiggling your ear doesn't change the sensation.
The "Hum Test" (A Quick Home Check)
While this does not replace a professional diagnosis, you can try this simple trick to gauge what might be happening:
Hum a continuous low tone to yourself.
Pay attention to where you hear your voice the loudest.
If your voice sounds louder in the BLOCKED ear: This suggests a conductive issue (like earwax or fluid). The blockage traps your internal bone vibrations, making your voice boom.
If your voice sounds louder in the GOOD ear: This is a warning sign. It suggests the nerve in the bad ear isn’t working, sending the sound only to your healthy side. This warrants immediate attention.
Why the "72-Hour Window" Matters
If you are experiencing Sudden Sensorineural Hearing Loss, the hair cells in your inner ear are currently under stress.
The standard treatment usually involves a course of corticosteroids to reduce inflammation and save those nerve endings. However, studies show that this treatment is most effective when started within 72 hours to 2 weeks of the onset. Waiting “a week to see if it gets better” can result in the hearing loss becoming permanent.
Common Causes: Why Did This Happen?
Patients diagnosed with Sudden Sensorineural Hearing Loss often ask, “What did I do wrong?” The answer is usually: nothing.
In nearly 90% of cases, the specific cause is classified as idiopathic, meaning the root cause cannot be pinpointed. However, the most common theories medical professionals look at include:
- Viral Infections: A cold, flu, or herpes virus that attacks the inner ear or auditory nerve.
- Circulatory Issues: Similar to a "stroke" in the eye or brain, a lack of blood flow to the inner ear can cause cells to shut down.
- Autoimmune Diseases: Where the body’s immune system mistakenly attacks the inner ear cells.
- Extreme Stress: High stress levels can impact blood flow and immune response, potentially triggering an episode.
What NOT To Do: Avoid Home Remedies
When panic sets in, many people turn to “Dr. Google” or old wives’ tales. If you have a blocked ear, avoid these common mistakes which can complicate a diagnosis:
Do not use Ear Candles: These are ineffective for wax removal and dangerous. They can cause burns or deposit candle wax onto the eardrum, making it harder for us to see what is actually happening.
Avoid Cotton Swabs (Q-tips): If the issue is wax, pushing a cotton bud into the ear often shoves the wax deeper against the eardrum, turning a minor blockage into a painful impaction.
Do not use “Ear Clearing” drops immediately: If your eardrum has perforated (which can sometimes cause hearing loss), putting liquid drops in the ear can cause a severe infection. It is safer to have us look inside first.
What Happens at the Appointment?
If you come to our clinic with sudden hearing loss, we treat you as a priority case. Here is what you can expect during the assessment:
Otoscopy: We look into the ear canal with a light. If it is full of wax, we remove it immediately. If hearing returns instantly—congratulations! You are in the clear.
Tympanometry: We test how your eardrum moves. This tells us if there is fluid behind the eardrum (common after a cold) or if the middle ear is healthy.
Pure Tone Audiometry: This is the decisive test. We measure exactly which frequencies are missing and whether the loss is Conductive (outer/middle ear) or Sensorineural (nerve).
If the test confirms nerve loss (SSHL), we will immediately refer you to an ENT specialist to discuss a course of steroids or hyperbaric oxygen therapy to try and restore your hearing.
Conclusion
Your hearing is one of your most vital connections to the world around you, yet it is often the sense we take the biggest risks with. We would never ignore sudden blindness in one eye for a week, yet we frequently ignore sudden deafness in one ear hoping it will “pop” back to normal.
If there is one takeaway from this article, let it be this: You are never wasting our time by getting a sudden hearing loss checked.
Frequently Asked Questions
1: Can diabetes cause permanent hearing loss?
Yes. Damage to nerves and blood vessels in the inner ear can become permanent if unmanaged.
2: Is hearing loss more common in Type 2 diabetes?
Both types increase risk, but Type 2 diabetes is more common overall.
3: Should people with diabetes get routine hearing tests?
Yes. Regular assessments are strongly recommended.
4: Can blood sugar control improve hearing?
It may slow progression and protect remaining hearing, even if damage can’t be reversed.It may slow progression and protect remaining hearing, even if damage can’t be reversed.
5: Are balance problems linked to diabetes too?
Yes. The inner ear affects both hearing and balance.
