Trichotillomania (Hair-Pulling Disorder)

Clinical picture

• Scalp, eyebrows, and eyelashes are the most common sites, while pubic, facial, and body hair pulling is common but rarely disclosed.
• Pulling occurs in an automatic mode outside awareness during sedentary activity and in a focused mode to relieve tension or a specific urge.
• Many patients report tension before pulling and relief or gratification afterward, though a substantial subgroup describes no conscious urge.
• Post-pulling rituals include inspecting the root, rolling the hair between the fingers, biting it, and swallowing it in 5-20% of patients.
• Camouflage with hats, scarves, wigs, and makeup, plus avoidance of swimming, wind, and salons, marks the functional cost of the disorder.
• Shame drives concealment, and many patients have never disclosed pulling to a clinician despite years of symptoms and dermatology visits.

Criteria snapshot

• Recurrent pulling out of one's own hair resulting in hair loss, from any body site, occurring over time rather than in a single episode.
• Repeated attempts to decrease or stop the pulling, which distinguishes the disorder from an untroubled and unproblematic habit.
• Pulling causes clinically significant distress or impairment in social, occupational, or other important areas of functioning.
• Not attributable to a dermatologic condition and not better explained by another mental disorder such as body dysmorphic disorder.
• Tension before pulling and relief afterward are no longer required, which broadens the diagnosis to include purely automatic pullers.

Neurobiology

• Best framed as a compulsivity and habit-learning disorder involving dorsal striatum, supplementary motor area, and weakened response inhibition.
• Structural imaging shows volumetric changes in striatal and cortical motor regions along with reduced white matter integrity in habit pathways.
• Glutamatergic modulation is supported by N-acetylcysteine 1200-2400 mg/day, which outperformed placebo in adults over 12 weeks.
• Heritability is substantial, and SLITRK1 and SAPAP3 findings converge with knockout mouse models that display compulsive self-grooming.
• Serotonergic agents show weak efficacy for pulling itself, distinguishing the disorder pharmacologically from OCD despite shared classification.
• Trichobezoar from trichophagia can cause obstruction, perforation, and Rapunzel syndrome, requiring endoscopic or surgical removal.

Psychology

• The behavioral model treats pulling as automatically reinforced by sensory stimulation and by relief from tension, boredom, or aversive affect.
• Internal and external cues, such as sitting at a mirror, driving, reading, or feeling a coarse hair, reliably trigger discrete pulling episodes.
• Emotion regulation accounts explain pulling as downregulation of boredom, anxiety, and frustration when other coping options feel unavailable.
• Shame and concealment reduce help seeking and drive social avoidance, which in turn maintains isolation and lowers competing activity.
• Perfectionism about hair symmetry or texture fuels focused pulling aimed at removing hairs judged coarse, gray, or otherwise imperfect.

Differential & comorbidity

• Exclude alopecia areata, tinea capitis, and traction alopecia; dermoscopy in pulling shows broken hairs of varying lengths and no exclamation hairs.
• Distinguish from OCD, where pulling would follow an obsession, and from BDD, where hair removal serves a specific appearance concern.
• Excoriation disorder co-occurs in a substantial minority of patients, so screen for both body-focused repetitive behaviors together.
• Comorbid major depression, anxiety disorders, and substance use are common and shape both engagement and treatment sequencing.
• Ask about abdominal pain, vomiting, and early satiety whenever trichophagia is present, since trichobezoar can present as obstruction.

Pharmacologic treatment

• No medication is FDA-approved; N-acetylcysteine 1200-2400 mg/day has the strongest adult evidence with a benign adverse effect profile.
• SSRIs are largely ineffective for the pulling itself but remain appropriate for comorbid depression and anxiety disorders.
• Clomipramine 100-250 mg/day shows modest benefit in small controlled trials; monitor ECG and anticholinergic burden closely.
• Olanzapine 2.5-10 mg/day reduced symptoms in a controlled trial, but weigh metabolic and sedation risk against the modest benefit.
• Pediatric N-acetylcysteine trials were negative, so behavior therapy remains the primary approach for children and younger adolescents.

Psychotherapy

• Habit reversal training is first-line, combining awareness training, a competing response, and social support across 8-12 sessions.
• Comprehensive behavioral treatment adds stimulus control and modality-specific strategies for automatic versus focused pulling patterns.
• Acceptance-enhanced behavior therapy and DBT-informed skills improve maintenance by targeting affect regulation and urge tolerance.
• Decoupling and stimulus-control tactics, including barriers, gloves, bandages, and fidget objects, reduce automatic episodes at known cue sites.
• Behavior therapy effect sizes are large and clearly exceed medication, though relapse is common without scheduled booster sessions.

Adjunct options

• Track with the Massachusetts General Hospital Hairpulling Scale or the NIMH Trichotillomania Severity Scale every 4-6 weeks.
• Photograph affected areas with consent to document regrowth, which sustains motivation more reliably than patient self-report alone.
• Coordinate with dermatology for scalp health and to definitively exclude alternative causes of patterned or diffuse alopecia.
• TLC Foundation for BFRBs resources, peer support, and group treatment reduce shame and the isolation that maintains concealment.
• Sleep regulation, stress reduction, and scheduled screen breaks lower cue exposure during high-risk sedentary evening periods.

Clinical pearls

• Behavior therapy beats medication here; habit reversal is the treatment, not an add-on.
• Ask whether they eat the hair; trichobezoar is a surgical problem waiting to happen.
• Automatic pulling needs stimulus control; focused pulling needs a competing response.