Goosebumps are a vestigial reflex that once made human ancestors' body hair stand up to retain heat.

Is it true that Goosebumps are a vestigial reflex that once made human ancestors' body hair stand up to retain heat?

Yes. The Smithsonian's Human Origins Program states that body hair stands up when cold to create warmth and that the reflex is left over from when ancestors had long body hair, directly supporting the claim. A dermatology review adds that the arrector pili muscle mediates thermoregulation by air-trapping and was thought vestigial in humans, while Wikipedia describes goosebumps as considered by some a vestigial reflex.

Verdict: SUPPORTED · 5 sources for, 0 against · Last checked 3 Oct 2026

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Phil, S., Zenis, A., B., A. J., K., F. K., E., G. J., & P., L. R. (2015). Vestigial Biological Structures: A Classroom-Applicable Test of Creationist Hypotheses. eric.ed.gov. https://eric.ed.gov/?id=EJ1052902

Why do we get goose bumps? | The Smithsonian Institution's Human Origins Program. (n.d.). humanorigins.si.edu. https://humanorigins.si.edu/education/fun-facts/why-do-we-get-goose-bumps

Goose bumps - Wikipedia. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Goose_bumps

Portela, B. S. (2026). Study of Vestigial Organs: Disuse and Evolution of the Human Body. doi.org. https://doi.org/10.47191/ijmra/v9-i6-11

N, T., NW, R., L, J., & RD, S. (2014). Beyond goosebumps: does the arrector pili muscle have a role in hair loss?. doi.org. https://doi.org/10.4103/0974-7753.139077