Page last modified: July 10, 2021
Hearing aids are electrical devices that assist perception of speech or other sounds. Hearing aid users frequently complain about squealing noises. This is usually because sound from the hearing aid speaker is getting into the hearing aid microphone, and is called "feedback".
Feedback results from sound coming from the speaker part of the hearing aid, "feeding back" into the microphone part. Feedback is especially a problem if:
Practically, feedback can nearly always be eliminated by separating the microphone from the hearing aid speaker. This happens naturally with a "BTE" or behind the ear type of device. It can be a bit tricker with other arrangements.