If you wear hearing aids, you’ve probably experienced it before — that sudden, high-pitched squeal or whistle that catches everyone’s attention. This sound is called feedback, and while it’s common, it can be frustrating or even embarrassing.
So what exactly causes a hearing aid feedback loop, and more importantly, how can you stop it from happening? Let’s take a closer look at how feedback works, what triggers it, and what you can do to enjoy clear, comfortable hearing again.
Understanding Hearing Aid Feedback
Feedback occurs when sound that’s already been amplified by the hearing aid leaks out of the ear canal and is picked up again by the device’s microphone. This creates a continuous loop of sound — an unwanted “echo” that grows louder and turns into the high-pitched squealing noise most users recognise instantly.
In simple terms, it’s the same effect you hear when a microphone gets too close to a speaker at a concert or event. The system keeps re-amplifying its own sound, creating an unpleasant whine.
Common Causes of Feedback
A feedback loop can happen for several reasons, and understanding them helps you or your audiologist pinpoint the right fix.
1. Poor Hearing Aid Fit
If your ear mould or dome doesn’t fit snugly in your ear canal, amplified sound can easily escape — especially during talking, chewing, or movement. Even minor changes in ear shape or weight loss can affect the fit.
2. Earwax Blockage
Earwax can reflect amplified sound back toward the hearing aid microphone. Over time, wax buildup narrows the ear canal and makes feedback more likely, even with perfectly fitted devices.
3. Device Damage or Wear
Cracks in tubing, loose microphone covers, or damaged receivers can disrupt the acoustic seal, causing leakage that leads to feedback. This is common in older hearing aids that haven’t been serviced recently.
4. Incorrect Volume or Settings
Turning your hearing aid volume too high or using the wrong program for your environment may overload the microphone and increase the chance of a feedback loop.
5. Physical Interference
Something as simple as a hat, scarf, mask strap, or even a phone pressed too tightly against your ear can redirect sound into the microphone.
Identifying When Feedback Is “Normal”
It’s important to know that occasional, brief feedback isn’t necessarily a sign of malfunction. For example, you might hear a short squeal when:
- Putting on or removing your hearing aids
- Hugging someone closely
- Adjusting your glasses or mask near your ears
These moments are normal and usually stop once the obstruction is removed. However, persistent or frequent feedback is a sign that your device or ear canal needs professional attention.
How to Stop Hearing Aid Feedback
If feedback has become a recurring issue, there are practical steps you can take — both at home and with professional help — to eliminate it and improve comfort.
1. Re-Insert Your Hearing Aids Properly
Make sure your devices are firmly seated in your ears. A loose seal is one of the most common reasons for feedback. You should feel a gentle but secure fit — not too tight, but not slipping out easily either.
2. Keep Your Ears Clean
Regular earwax removal helps maintain clear sound transmission. Avoid using cotton buds, as they often push wax deeper. Instead, schedule professional earwax removal at a certified hearing clinic like Amazing Hearing, where safe methods such as micro-suction are used.
3. Check for Visible Damage
Inspect your hearing aids for cracks, moisture buildup, or loose tubing. If anything looks damaged, bring them in for servicing or repair — do not try to fix them yourself.
4. Adjust the Volume
If you often turn your hearing aids up to maximum, the cause might be an outdated hearing setting, rather than your actual hearing needs. Your audiologist can recalibrate or fine-tune the amplification levels for optimal comfort.
5. Avoid Obstructions
Be mindful when using accessories like masks, hats, or headphones. Try to prevent direct pressure around your ears that could disrupt the hearing aid’s position.
6. Get a Professional Refitting
If your ears have changed shape slightly — due to weight loss, aging, or health factors — your ear moulds or domes may need resizing. A simple refitting can often stop chronic feedback instantly.
Advanced Feedback-Reduction Technology
Modern hearing aids are designed with feedback suppression systems that detect and cancel out the sound loop before it becomes audible.
Some advanced features include:
- Adaptive Feedback Cancellation: Constantly monitors sound and automatically neutralises feedback.
- Phase Inversion Technology: Cancels feedback by producing an opposite sound wave.
- Digital Ear Scanning: Used during fitting to ensure a perfect, feedback-resistant seal.
If your current hearing aids are several years old, upgrading to a newer model can make a remarkable difference in comfort and performance.
When to See an Audiologist
If you’ve tried the above steps and the squealing persists, it’s best to visit a hearing care professional. Continuous feedback may point to deeper issues, such as:
- A damaged receiver or microphone
- Excessive earwax buildup
- Incorrect hearing aid programming
- Ear infection or canal swelling
An audiologist can perform a quick diagnostic test, inspect your ears, and use specialised tools to identify the exact cause. Most feedback issues are fixable within a single visit.
Preventing Future Feedback
To keep your hearing aids performing at their best:
- Schedule regular maintenance and cleaning appointments.
- Store them in a dry box or dehumidifier overnight to prevent moisture damage.
- Keep spare domes and filters handy, and replace them as recommended.
- Update your hearing aid programming annually to match any hearing changes.
Consistent care ensures not only clearer hearing, but also longer device lifespan.
Takeaway
A hearing aid feedback loop isn’t just an inconvenience — it’s your device’s way of telling you something needs adjustment.
Whether it’s an earwax issue, a loose fit, or outdated technology, identifying the cause early prevents further frustration and protects your hearing investment.
Professional Help at Amazing Hearing
At Amazing Hearing, our audiologists are experienced in diagnosing and resolving all kinds of hearing aid issues — from persistent feedback to fine-tuning for optimal clarity. We provide:
- Comprehensive hearing tests
- Earwax removal using safe, non-invasive methods
- Professional cleaning, refitting, and reprogramming
- The latest hearing aids with advanced feedback-cancellation features
Don’t let annoying squeals interrupt your day.
Book a consultation today at Amazing Hearing or visit any of our centres across Singapore. Let our experts help you enjoy crisp, feedback-free hearing — every day.
