While I'm an outspoken proponent of anagesia and am happy to be called "Candyman" by the amount of Fentanyl I give out... let's be honest here.
10/10 (or more) pain will manifest itself in some outward way. If someone says they're 10/10 (or my pet peave, 11+/10) and there is no other possible way to show (even as little as a small facial grimace) aside from them just saying "10", I'm going to doubt they understood my directions, or failed kindergarten math. 10 is the wrost you've ever been in, EVER. I've yet to see someone in true 10/10 pain that weren't on the verge of crying/screaming out, if not already there. I don't care how much 'tolerance' for pain you have, 10/10 will do SOMETHING to you.
If you say 12/10 abd pain, cramping, and you jump up and walk to me with a smile on your face... yeah, I'm calling a spade a spade. I won't ever doubt someone is in pain... doesn't mean I can question the number they give me to myself.
But just because I don't believe them, I never said a word about withholding. ($10 says someone is going to ignore that last tidbit and jump in with a "It's not your job to believe" or some crap of that nature)