Aspies generally have high pain tolerance, or total disregard to pain

I've noticed that high pain tolerance, or just total disregard to pain is a common thing amongst aspie and autistic people and this may be a scary thing.  David and myself both have high tolerance to pain and have disregarded many things however the reason I am bringing this up now is because David, who is nine, had an incident a few days ago that should have received more treatment reminded me of an incident that I had when I was eight years old.  David stayed the night at (great) grandma and grandpa's house and we didn't pick him up until later on the next day so we were not there when he got hurt we only heard about it.  David fell and got a gash in his leg and then he told grandma about it and then told her that he was going to bandage it up.  Grandma said that she only got a quick glance at it and it didn't look too bad and she thought that it was just a small scratch but when we took off the bandaging later on there was a huge gash in his leg about 1/4" wide and 2" long and it looked deep but he handled it and said he was fine.  The incident that happened to me when I was eight actually happened during my eight, and final, birthday party as this was the first party at the new house all of my cousins and aunts and uncles were there and since I knew the landscape I thought that everything was so cool and had to show my cousins around.  There are two ponds on the property separated by a two foot strip of land so I decided that I would walk them between the narrow strip of land and halfway through I slipped and fell and landed onto a broken piece of glass about an inch deep and across however I just stood right back up and instead of instinct telling me to take the glass out common knowledge told me to leave it in for if I had taken it out it would have started to bleed and then would have mostly caused panic and drew attention on me and probably got me a hospital visit.  The last thing that I wanted was to have to go to the hospital because my parents agreed to let my aunt and uncle take me back home with them and stay for a couple of days and I was excited about that since we moved quite a distance away I haven't seen them for about six month before that and I was used to seeing them at least once a week.  Nobody was able to notice the glass in my ankle as I was able to keep it fairly concealed and the only way that someone found out was when I was at my cousins house my aunt made me take a bath, after about twenty minutes she came in to give me a towel and tell me to get out when she my ankle and asked what was in it and I told her nothing and that's when she proceeded to take out the glass and blood came spewing out so we had to gauze it up and of course she had to call my mom to tell her about it, they were both panicky and furious about the situation and all I could remember thinking is what's the problem, it's no big deal, it doesn't hurt and it's bandaged up now just let me hang out with my cousins.  I ended up staying that night and one extra night with them before coming home when my parents actually seen the  wound and thought it needed more treatment when I convinced them that it only needed clean band-aids and some neosporin.  That is the story of me and why I didn't tell anyone, as far as David's reasoning I'm not sure about other than I'm guessing that he just wanted to keep playing and wanted to go swimming and we may have not let him if we knew exactly how bad it was.  Those are just a couple of examples of the more severe pain tolerance that we have overcome however there have been many more instances in which in most cases would have ended up in emergency room visits but not in ours.  This may be a scary situation for parents of autistic children because of our total disregard to pain and injury you never know how bad something truly is because we don't know how bad it truly is and can't answer truthfully on the pain scale, and although we've had many minor incidents there could have been more severe ones.  The other issue is that most aspie and autistic children crave impact as a form of release and I have burnt myself a few times to let out some pressure because I actually like the pain, I have not seen David doing anything that severe yet other than just throwing himself on the ground however he is still only nine and I haven't started doing anything more severe until my teenage years.  I have never done any cutting or anything more severe than burning however all people are different in ways of releasing their tensions so I am going to say it would be best to find alternate measures of stimming at a young age before having to deal with it during the adolescent years as many studies indicate that those are the most critical years as far as rage, violence and self inflicted pain.  I don't want to scare anyone however I also don't want anyone to be surprised if your aspie or autistic child goes through these phases.