Dr. Ali Mattu explains the whens, wheres, whys, and hows of trichotillomania, hair-pulling disorder. People can get stuck running their hair through their fingers, on their face, collecting it, or chewing or swallowing their hair—not just gross, dangerous. The risk for hair-pulling is passed on through genes, but genes aren't your destiny. Biology might start hair-pulling, but that's not the reason people keep pulling. It's all about emotions. Find out about strategies and effective treatments for hair-pulling, and more.