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Reasons why your hearing aids are whistling

Have you noticed a whistling sound from your hearing aids? This guide breaks down seven possible causes and solutions so you can get back to living and hearing your best.
Published 9/30/2025,
Updated 9/24/2026
2 min read
Reviewed by Bloom Hearing Specialists New Zealand
Hearing aidsTips and tricks
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Understanding why hearing aids whistle

Why do hearing aids whistle?

If you notice a whistling sound in your hearing aids, you’re definitely not alone. It’s known as hearing aid feedback, and it’s a high-pitched noise that can occur when sound that should go into your ear canal is detected by the microphone of your hearing aids and gets amplified.1

This is different from tinnitus, where you hear a high-pitched noise coming from inside your ear. Hearing aid feedback is common and often easy to fix. Here are seven possible reasons for whistling and what you can do about it.

How to stop hearing aid feedback

Reason 1: Improper fit

Interestingly, your ear canals can change shape over time. For example, weight changes can cause earmoulds to lose their secure fit. When earmoulds become loose, sound may escape and be picked up by your hearing aids’ microphones, causing feedback.2
Hearing impaired customer choosing between hearing aids during an appointment with a specialist.

Reason 2: Earwax or debris buildup

“If your ear canal is blocked with wax, sound from your hearing aids can bounce off the wax and back into the microphone, causing feedback or a whistling noise,” says clinical audiologist K. Durrheim. "In these cases, it's best to have the wax professionally removed for clear, comfortable hearing."
  • Solution: Examination and Cleaning

    Have your ears examined and cleaned by a health professional, and also check your hearing aids to make sure the receivers and vents (tiny openings in the hearing aid tubes) are not clogged.1

Reason 3: Damage to hearing aid tubing

In some hearing aids, wear and tear can cause the tube that connects to the earmould to become hard and shrink. The tubing then starts to pull the earmould, which can disturb the snug fit. In addition, the tube can also become damaged from general use. A small tear in the tube can cause sound to “leak” which causes feedback.

Reason 4: Volume set too high

While it can be tempting to turn up the sound, setting the volume on your devices too high can cause sound to re-enter your hearing aids and cause feedback.1
  • Solution: Adjust volume

    Turn down the volume of your hearing aids and avoid the point where the sound becomes so loud that it creates feedback. Modern hearing aids feature advanced technology that reduces feedback.

    If you find that you would like the volume of your hearing aids turned up, follow up with your audiologist to fine-tune your hearing aid settings for best results.
Happy senior couple wearing hearing aids and playing guitar outside house near backyard garden

Reason 5: Incorrect insertion

If you’re new to wearing hearing aids, or you’ve switched to a new style, rest assured that a period of adjustment is completely normal. Still, it’s important to check that your device is properly inserted.

"If your hearing aids aren't fitting just right, sound can get out and be picked up again through the microphones, which leads to a whistling sound," explains Durrheim.


Solution

Here are some tips on inserting in-the-ear and completely-in-canal hearing aid models.
  • Correct sides

    Identify the left (blue) and right (red) devices
  • Handling

    Hold your hearing aids between your thumb and forefinger
  • Inserting

    Gently insert it into your ear canal, following the natural shape, until snug with the wire sitting flush against the outer ear

Reason 6: Your hearing has changed

"Whistling can also happen depending on the kind and severity of your hearing loss," says Durrheim. "As your hearing changes over time, it can affect how your hearing aids sound."
  • Solution: Visit us

    "You may need a different dome or even a custom earmould for a better seal and to help prevent feedback," Durrheim says. "Switching to a better fitting option often solves the problem."

    If home cleaning and maintenance aren’t helping you enjoy clear and comfortable sound, get in touch with an expert audiologist for personalised advice.

Reason 7: Technical malfunction

Technical issues can also emerge, such as loose or displaced microphones, or damage to the amplifier or receiver. These can be caused by everyday wear, missed maintenance or accidents.
  • Solution: Contact your hearing care professional

    Nobody likes a technical malfunction, especially not with hearing aids. Reach out to your hearing care professional so they can help you investigate and ensure your hearing aids are correctly adjusted or repaired.

Book Your Free Hearing Check

If you or a loved one are experiencing signs of hearing loss, a free hearing check is a great place to start.
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Sources:

1. Widex: 5 Reasons why your hearing aids are whistling:
https://www.widex.com/en-ca/blog/global/5-reasons-why-your-hearing-aids-are-whistling/

2. Surmeli M, Deveci I, Canakci H, Canpolat MS, Karabulut B, Yilmaz AAS. Effect of Body Mass Index on Auricular Morphology and Auditory Functions. Ear, Nose & Throat Journal. 2019;98(7):E81-E86. doi:10.1177/0145561319840579

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