Why do you get goosebumps to fear?

Goosebumps occur due to the activation of the body's fight-or-flight response in reaction to fear. When faced with a perceived threat, the sympathetic nervous system triggers tiny muscles at the base of hair follicles to contract, causing the hairs to stand up and creating goosebumps. This reaction is part of an evolutionary defense mechanism, potentially making our ancestors appear larger to predators or aiding in insulation. Additionally, the sensation can serve as a physical manifestation of heightened emotional states, such as fear or excitement.