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People who have trichotillomania have an irresistible urge to pull out their hair, usually from their scalp, eyelashes, and eyebrows. Trichotillomania is a type of impulse control disorder. People with these disorders know that they can do damage by acting on the impulses, but they cannot stop themselves. They may pull out their hair when they’re stressed as a way to try to soothe themselves.
The exact cause of trichotillomania isn’t known. It may be related to abnormalities in brain pathways that link areas involved in emotional regulation, movement, habit formation, and impulse control.
Source: https://www.webmd.com/anxiety-panic/guide/trichotillomania#1
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