Similar to a public address system, a hearing aid can hum, whistle, or ring when amplified sound comes out of the hearing aid’s loudspeaker and is picked up by the microphone and re-amplified, over and over again. This creates what’s called an acoustic feedback loop.
Possible causes of feedback include:
Improper insertion into the user’s ear.
Improper physical fit of the hearing aid.
Improper calibration of the hearing aid.
If you are having any of these issues, the best solution is to visit a professional who is capable of adjusting the devices or working with you on the proper physical fit or insertion.. Modern hearing aids can easily be adjusted by a professional to permanently avoid feedback. If you have the capability to adjust the volume of your hearing aid, turn the volume down until the feedback stops. This is a fine temporary solution until you can see your hearing health professional.
For a much more in-depth explanation on acoustic feedback in hearing aids, more can be found here.
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