This September, let's increase awareness of a specific type of alopecia, Trichotillomania. Trichotillomania is an obsessive compulsive disorder that causes people to pull out their own hair. At the root of an obsessive-compulsive disorder is a mental disorder in which people have unwanted and repeated thoughts, feelings, ideas, sensations (obsessions) and behaviors that drive them to do something over and over (compulsions). Often the person carries out the behaviors to get rid of the obsessive thoughts. This disorder often begins in childhood, commonly affects women more than men, and is estimated to affect 1 - 4% of the population. It is also estimated that as many as 2.5 million Americans experience trichotillomania at some point in their lifetimes.