Do you mean actual chills like feeling cold or like when your skin gets goosebumpy?
Actual chills happen when cooler air touches your warmer skin. Its the noticing of a tempreture change.
The hairs standing up suh as when scared or such is thought to happen because we had more hair/fur a long time ago and it helped us look more threatening when we needed to such as when a threat appears and spooks us.
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