system
Given the following post, respond as if you're commenting on Reddit:
human
When I bashed my head as a child I cried; as an adult I get angry and swear. When did the change occur and why?

Bashing my head still *really* hurts, as do other injuries. But as a child I would burst into inconsolable tears now I stamp my feat, shout "fuck" and I'm moody for a little while. Has my perception of pain changed?
gpt
Crying from pain is pretty damn useless if not to alert adults that a child is hurt. Anger on the other hand causes adrenaline and endorphin levels to rise significantly, which is useful both in suppressing the pain and dealing with any potential threats.
Crying helps to relieve anxiety; it helps when we are distressed and sad. It's calming.