My pain-tolerance, or not recognising pain, comes from the side of my dad though. And I think it is more an aspie thing. Just not recognising it. Or blocking it completely.
Read a study on the topic years ago, but it wasn't about autism. According to the study, the socially excluded in general experience higher tolerance to physical pain and decreased empathy.
http://diginole.lib.fsu.edu/cgi/viewcontent.cgi?article=1179&context=etd
Don't know if that is what it is. I can tell very precisely what is wrong with a tooth, at the dentist. I miss the agony sensation. When I see a physiotherapist, I can tell her what "pain" feels healing and what "pain" indicates something wrong. She has hardly any other client who feels so accurate. And no one who feels so accurate with a high pain threshold like mine.
My oldest, extremely socially gifted, brother is very similar to me, when it comes to things like this.
If I do feel pain, the suffering sensation misses, in the sense of the "woe me, why me, etc."
It's more like how Temple Grandin explains pain from an animal pov in "Animals in Translation".