Kids will run and tumble and bonk their heads and get up laughing. Then they'll catch their finger and look at it: if it looks fine, they carry on but of they see a drop of blood, suddenly they're in mortal pain and the end times are nigh as they scream in agony.
I don't think people grow out of that. The stakes just change as they get older.
For kids, one could argue that they still have to learn what pain is, just as they have to learn what it is to be physically tired (go on a walk with them until they say they’re too tired to make another step. At that moment, point out there’s an ice cream vendor or a playground a kilometer away, and be amazed).
Kids sometimes also (consciously or unconsciously) play the tired/injured card just to get attention (that probably applies to some grown ups, too)
https://theconversation.com/emotions-affect-how-pain-feels-a...:
“In 1943 and 1944, Beecher, who was described by friends as a street fighter in the field of medicine, travelled to the Venafro and Cassino fronts in Italy, where he questioned 215 seriously wounded men who were waiting on the beachfront to be evacuated by boat to hospital. He concluded that the anecdotal evidence was correct: there was no necessary correlation between the seriousness of any wound and men’s expressions of suffering. In fact, three-quarters of wounded soldiers claimed that they weren’t experiencing significant pain and didn’t ask for pain relief, even when offered it.
[…]
In contrast, suffering a similar kind of injury in civilian contexts (a car crash, for example) was excruciatingly painful because it heralded “the beginning of disaster”. Beecher confirmed anecdotal evidence that being wounded was viewed as good luck: wounds enabled men to escape “this hell with nothing more perhaps than the loss of half a foot”, as one World War I soldier put it. Emotions and expectations affected physiological sensations.“
Also, I think we should educate people that, if an expert says “we can’t find anything physical, so I think it’s in your head” doesn’t mean you put it there, or that you should be able to take it out without any help and, hence you’re to be blamed for it.
(I also think we should educate doctors to tell patients that “we can’t find” doesn’t mean “there isn’t”)