system
Given the following post, respond as if you're commenting on Reddit:
human
Why are nose bleeds relatively painless, when other similar wounds on the skin are painful?
gpt
OP, nose bleeds are caused by injuries from an internal source of your body. When you get a cut on your arm, leg, etc., there are nerves built to transmit pain to your brain - and these nerves are triggered. We evolved to have pain-sensing nerves around our entire body, because feeling pain is advantageous for obvious reasons. However, since the body usually won't harm itself from the inside we don't have pain sensors in our internal areas, such as deep in the nasal cavity. So even though you've got a cut vessel there, there's no nerve to send a pain signal from there to your brain.