Goosebumps are tiny muscle contractions at the base of hair follicles.
When cold hits, your body tries to trap heat by fluffing up body hair.
Fear, awe, or nostalgia can also trigger goosebumps—linked to adrenaline release.
Goosebumps are a leftover survival reflex from when we had more body hair.
It’s part of the "fight or flight" response, prepping the body for danger.