Plainly
look up a word, understand it — no rabbit hole
pain
nounPAYN
meaning in plain English
A bad, hurt feeling in your body that tells you something is wrong.
Think ouch — pain is your body alarm that something hurts.
for example
I stopped running because the pain in my feet got worse.
Imagine you stub your toe and it throbs; that sharp feeling is pain warning you something is wrong. You feel it and you try to protect that spot.