Whistling Hearing Aids? 4 Possible Causes

A sudden whistling noise in your hearing aids can be unpleasant and alarming. People who wear hearing aids often report hearing a high-pitched feedback noise when doing certain things, such as putting their hearing aids on in the morning or pulling a hat over their ears.  This feedback happens when a sound that should go into your ear leaves your ear canal and bounces back into the microphone of your hearing aid.