Question

Why do certain sounds make your skin crawl?

Answer 1

It's the feeling of the sound which makes your skin crawls.

When you close your ear and try to hear the same sound you won't feel anything.

Answer 2

Imagine chalk scraping against a blackboard, or teeth against a fork — why do we cringe at these sounds? In a new study, scientists reveal what is actually going on in the brain to make us recoil at certain noises. ... Researchers were then able to study the brain response to each type of sound.