Although no broad-based population epidemiologic studies had been conducted as of 2009, the lifetime prevalence of<unk>  is estimated to be between 0.6% and 4.0% of the overall population. With a 1% prevalence rate, 2.5 million people in the U.S. may have<unk>  at some time during their lifetimes.<unk>  is diagnosed in all age groups; onset is more common during preadolescence and young adulthood, with mean age of onset between 9 and 13 years of age, and a notable peak at 12–13. Among preschool children the genders are equally represented; there appears to be a female predominance among preadolescents to young adults, with between 70% and 93% of patients being female. Among adults, females typically outnumber males by 3 to 1. "Automatic" pulling occurs in approximately three-quarters of adult patients with<unk> .
Trichotillomania
Alopecia areata
Koilonychia
Loose anagen syndrome
Onychotillomania
Trichostasis spinulosa
Tinea imbricata
Necrospermia