My son has been developing a tic, or some type of twitch, where he tenses up his whold stomach. He did it for awhile a few months ago, and then stopped. He started again a week ago, and it seems to be getting worse by the day. It happens in various situations, while he's relaxed and watching t.v., at mealtimes, while he's standing, or even during active times such as karate. He says it just doesn't feel right if he doesn't do it, and at times I think he tries to stop, but at other times I don't even think he realizes he's doing. I feel like I should call his doctor, because his peers are starting to notice, but then again, I don't want to subject him to a lot of unnecessary tests, and do not want to deal with any requests to medicate him this early in childhood either. Any advice would be appreciated.