I have a nephew that doesn't feel pain as intensly as most folks do.

When he was little his doctor's actually told my sister she'd need to make sure that when he did get hurt (as kids often do) that it wasn't a serious injury. He got bitten on the leg by a spider once but didn't tell her about it until a week later. It was still red & swollen but he hadn't said anything because "it didn't hurt".

For a bright kid my nephew can be real dumb sometimes.