hoarding disorder

DEFINITION / DSM-5 CRITERIA: (1) Persistent difficulty discarding or parting with possessions, regardless of actual value. (2) Difficulty is due to a perceived need to save the items and distress associated with discarding them. (3) Results in accumulation of possessions that congest and clutter active living areas and substantially compromise their intended use (if living areas are uncluttered, it's only because of third parties, e.g., family or authorities). (4) Causes clinically significant distress or impairment (including maintaining a safe environment). (5) Not attributable to another medical condition (e.g., brain injury, cerebrovascular disease, Prader-Willi syndrome). (6) Not better explained by another mental disorder (e.g., OCD obsessions, major depression psychomotor retardation/low energy, psychosis delusions, major neurocognitive disorder cognitive deficits, ASD restricted interests). Specifiers: with excessive acquisition (excessive buying or collecting free items; present in most patients); insight level: good/fair, poor, or absent insight/delusional beliefs.

EPIDEMIOLOGY: Prevalence about 2-6%. Onset typically in adolescence (around 11-15 years), symptoms worsen with age and are most severe in older adults (55+). Chronic, progressive course. Roughly equal sex distribution in community samples (clinical samples skew female). Strong familial component (about 50% heritability); frequently positive family history.

PATHOPHYSIOLOGY: Not fully understood. Cognitive models propose deficits in information processing (decision-making, categorization, organization, attention), strong emotional attachment to objects, and avoidance behaviors (discarding triggers anxiety/grief; saving provides relief). Neuroimaging shows abnormal activity in the anterior cingulate cortex and insula (during discarding decisions) and orbitofrontal/prefrontal dysfunction. Can emerge after frontal lobe/ventromedial prefrontal damage.

KEY ASSOCIATIONS: Common comorbidities: major depressive disorder (most common, about 50%), anxiety disorders (social anxiety, GAD), ADHD (especially inattentive type), and OCD (about 20%). Often a history of traumatic or stressful life events. Associated with indecisiveness, perfectionism, and procrastination.

KEY DISTINCTIONS (high-yield for boards): - vs OCD: In OCD, hoarding is driven by intrusive obsessions (e.g., contamination, harm) and is typically unwanted, ego-dystonic, and often not accompanied by pleasure; items are often bizarre (e.g., urine, feces). In hoarding disorder, saving is deliberate, ego-syntonic, and associated with positive emotions during acquiring; distress arises with discarding. Hoarding disorder is less responsive to standard OCD treatment. - vs Collecting: Collectors organize items and display them; collections don't impair living space or function. - vs Diogenes syndrome (senile squalor): Hoarding plus extreme self-neglect and domestic squalor, typically in older adults. - vs Dementia/frontotemporal dementia, schizophrenia (negative symptoms), and Prader-Willi: hoarding arises from these other conditions. - Animal hoarding: a variant considered a manifestation of hoarding disorder, often with poor insight and severe neglect of animals.

CLINICAL SIGNIFICANCE: Poor insight is common; patients are often brought in by family or authorities. Risks include fire hazards, falls, poor sanitation and infestation, medical neglect, eviction, social isolation, family conflict, and elder self-neglect. Consider involvement of social services/public health in severe cases.

TREATMENT: First-line: CBT specifically adapted for hoarding (motivational interviewing, skills training in organizing/decision-making, exposure to discarding and not acquiring, cognitive restructuring). Pharmacotherapy: SSRIs (e.g., paroxetine, venlafaxine SNRI) show modest benefit; treat comorbid depression/anxiety. Stimulants/atomoxetine may be considered for comorbid ADHD (inattention may improve). Harm reduction approaches are useful in low-insight patients. Forced clean-outs are ineffective and lead to relapse.

BOARD PEARL: A patient, typically older, with a home so cluttered that rooms can't be used, who becomes distressed at the thought of discarding items and reports no obsessions or rituals, has hoarding disorder, not OCD. Best next step/treatment: CBT (SSRI as adjunct).