system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why does anger increase pain tolerance?
gpt
Anger produces adrenalin.

The same chemical stimulant your body drugs you with when you are very, very afraid. It's an if-all-else-fails flight-plan. If you get so scared that you are running for your life, your body "helps" you by ensuring that you don't really notice such minor issues like broken bones and shit that might slow you down at a bad time. Instead you get all the pain served in one go when you have slowed down, hoping that you have hidden well already when it knocks you.

Anger is the feeling most parents feel when they need to protect their children. The adrenalin rush is what makes people knock the teeth out on someone they mistake for a kidnapper or someone doing harm to their children. Because if you look at it, protecting your young is also super important. And you should just do it and bother about the aftermath later. At least from the point of view of the species as a whole.