This happens when my hearing makes "a looping feed back to hearing aid" - when its microphone picks up the its output of amplified sound, it makes continous loop of sounds and increasing up to its limits in loudness and frequency (the loudest sounds, with highest frequency, the shrilling noise). When I put earmolds in my ear, the feedback stops unless it "leaks" or exposed and the feedback begins all over again. The ear changes its shape when my jawbone and facial muscles moves, and it opens up the feedback. And I can't hear the feedback myself, but all hearing people can! I have lots of embarassing moments, too.
So when I smile, I used to make a half-smile and nodd my head to express my "big smile". After I had the implant, I turned the hearing aid on and I heard the feedback for the first time ever. It is really annoying!!!
Now that I have cochlear implants, the feedback is impossible - the output is in electronic form instead of ampfied sounds. Lo and behold, no more feedback - and I am able to make the biggest smile as I can - and that made a big difference about myself! I'm very happy that I don't have to "suffer" the feedback moments anymore.
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