Some individuals may deny their hair pulling to others. The majority of individuals with
trichotillomania also have one or more other body-focused repetitive behaviors, including
skin picking, nail biting, and lip chewing.
Prevalence
In the general population, the 12-month preval ence estimate for trichotillomania in adults
and adolescents is 1%–2%. Females are more frequently affected than males, at a ratio of
approximately 10:1. This estimate  likely reflects the true gender  ratio of the condition, al-