The whistling sound sometimes produced by hearing aids. Feedback occurs when amplified sound from the hearing aid enters the microphone and causes a feedback loop. Caused by poor fitting or loose earmoulds, or a build up of wax in the ear canal. 

Find out how to stop feedback in our video 'How to manage the whistling in your child’s hearing aids'.

Thumbnail for whistling film

You can find all our ‘how to’ videos on our YouTube channel.