system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 why rubbing your head after banging it helps in reducing pain?
gpt
When you whack your head, your nerves are sending pain signals to your brain. Nerves can only send one signal at a time. By pressing/rubbing on your head, you override the pain signals and replace them with pressure signals. That's why as soon as you stop, the pain comes back.