Researchers at UCLA have found that social rejection can increase the severity of physical pain. In an experiment in 2006, Dr. Naomi Eisenberger asked subjects to rate the intensity of their physical pain from a standardised heat stimulus, then play a computer game in which some of them experienced social rejection (by being left out of the game by other players). The participants who were left out reported 67% more social distress, and also higher pain ratings on the standardised heat test. Since autistics often suffer social rejection, they may experience physical pain more acutely then the average person. Read more about it at the Lumosity Blog.