what causes hearing aids to whistle

3 min read 23-12-2024

Hearing aids are amazing devices that can significantly improve the quality of life for millions of people with hearing loss. However, sometimes they can produce a high-pitched squealing sound, known as feedback or whistling. This can be incredibly frustrating, but understanding the causes can help you troubleshoot and resolve the issue. This article will explore the common culprits behind whistling hearing aids and offer solutions.

Understanding Hearing Aid Feedback (Whistling)

Hearing aid feedback, that annoying whistling sound, occurs when sound from the hearing aid's speaker leaks out and is picked up by the microphone. This creates a loop, amplifying the sound until it becomes a piercing whistle. Think of it like a microphone placed too close to a speaker at a concert – the same principle applies.

Common Causes of Hearing Aid Whistling

Several factors can contribute to hearing aid feedback. Let's explore the most frequent ones:

1. Poor Fit

A loose or ill-fitting hearing aid is a major cause of whistling. Gaps between the hearing aid and your ear canal allow sound to escape and be re-amplified. This is especially common with custom hearing aids that haven't been properly fitted or molded.

Solution: Schedule an appointment with your audiologist for a proper earmold fitting or adjustment. They can ensure a tight seal to prevent sound leakage.

2. Earwax Buildup

Earwax (cerumen) can obstruct the sound pathway and create a partial blockage, leading to feedback. Even a small amount of wax can interfere with the hearing aid's performance.

Solution: Regularly clean your ears gently with a soft cloth or, as recommended by your audiologist, use special earwax removal tools. Do not use cotton swabs, which can push wax further into the ear canal. Professional ear cleaning by your audiologist may be necessary.

3. Damaged or Obstructed Sound Tube (for BTE Hearing Aids)

In Behind-the-Ear (BTE) hearing aids, a damaged or blocked sound tube can disrupt the airflow and cause feedback. This might be due to a kink in the tubing, a blockage from debris, or a compromised seal where the tube connects to the hearing aid and earmold.

Solution: Check your sound tube for any kinks or obstructions. If damaged, replace the tube. Ensure a proper connection at both ends. If the problem persists, consult your audiologist.

4. Incorrect Volume Setting

Setting the volume too high can increase the chance of feedback. While you want to hear well, excessive amplification can overload the system and cause whistling.

Solution: Gradually increase the volume until you achieve comfortable hearing without feedback. If high volume still produces whistling, consult your audiologist.

5. Improper Insertion/Placement

Improper placement of the hearing aid in the ear can also contribute to feedback. Make sure the hearing aid is properly seated and aligned within the ear canal.

Solution: Review your audiologist's instructions on inserting and removing your hearing aid. If you still have difficulty, ask for further guidance.

6. Environmental Noise

Excessive background noise can sometimes make hearing aids more prone to feedback. This is particularly true in situations with high levels of reverberation (echoes), such as large rooms or halls.

Solution: There isn't much you can do about environmental noise, but your audiologist might be able to adjust settings to help mitigate this issue.

7. Hearing Aid Malfunction

Occasionally, a hearing aid itself might malfunction and cause feedback. This is less common but could be due to a component failure within the device.

Solution: Consult your audiologist or hearing aid specialist to have the device checked and potentially repaired or replaced.

Preventing Hearing Aid Whistling

Besides addressing the causes of existing whistling, preventative measures are vital:

Regular check-ups: Schedule routine appointments with your audiologist for cleaning, adjustments, and inspections.
Proper cleaning: Keep your hearing aids clean and free from earwax and debris.
Handle with care: Avoid dropping or mishandling your hearing aids to prevent damage.

When to See Your Audiologist

Persistent whistling, despite your troubleshooting efforts, warrants a visit to your audiologist. They can properly diagnose the issue and make the necessary adjustments or repairs to ensure optimal hearing aid function. Don't suffer in silence – professional help is readily available. Addressing feedback promptly prevents frustration and ensures you get the maximum benefit from your hearing aids.