Kids with high pain tolerance

My bio daughter, who is now 4, has an extremely high pain threshold. She has had numerous severe ear infections over the past couple of years. The only way we have figured it out was that she kept saying "what?" all the time and asking me to turn up the TV or radio. When we asked her if her ears hurt, she always said no. She can fall down and get huge bruises all over and you won't hear a peep out of her. She'll just keep going and playing. Part of the reason why I think she doesn't respond, is that whenever we saw her "get hurt", we didn't respond to it. (Obviously, if she really got hurt, we would, but we would try not to let her see us react too much). The one thing I do notice, however, is that if she is over-tired, she will cry much easier. I agree with the other posters to mention it to your pediatrician just to be on the safe side.