Some people yank hair from their heads, eyelashes, eyebrows, or other parts of their bodies. Anxiety or boredom can trigger it. In some cases, people don’t know they’re pulling their hair. Trichotillomania often starts between ages 10 and 13, but it can be a problem for life. You can try to replace it with another, more healthy habit. For example, you might knit, crochet, or cross-stitch to keep your fingers busy.