system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does it hurt more to pinch or hit parts of your body such as fingers when they’re very cold?
gpt
Our body uses some of the same pathways for sensing cold as it does for pain. So when our skin is cold, the sensory nerves have a heightened sensitivity to pain stimuli. 

Interestingly, this might be a protective mechanism- allowing us to sense pain and detect injuries despite the numbing effect of the cold.