I am not sure. I guess because they must be at certain frequency to stimulate pain receptors without quite activating them….so it´s sort of like an irritation. I imagine each person has a different threshold for this!
It’s weird, isn’t it!?
There are a few theories on this; one is that certain sounds mimic the call of a predator and cause a fear response.
I think Ildiko is right and the ear seems to amplify certain frequencies, causing pain.
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