system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does it hurt more to accidentally bump something with my fingers when my hands are really cold?
gpt
Colder temperatures cause your blood vessels to constrict. This is to help preserve core temperature.

Constricted blood flow = lower volume of blood in the extremities.

Because of this, the nerves are closer to the surface and therefore more sensitive.