Why does my hearing aid squeal? How can I stop it?

Squealing or whistling describes what is called Feedback. Feedback falls into 2 categories:

  1. Internal: This type of feedback is due to a part inside the hearing aid being out of place. To fix this the hearing aid must be sent back to the manufacturer for repair.
  2. External: This type of feedback is due to the amplified sound leaking out around the shell of the hearing aid. The shell must either be remade or the size/style of the hearing aid must be changed to reduce the chance of feedback.