Areas of Clinical Focus· Mood & Anxiety Presentations

Obsessive-compulsive & related disorders

Frequently testedCovers obsessions vs. compulsions; body dysmorphia, hoarding overview.

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Study summary

The whole OCD family runs on one loop: an unwanted thought spikes anxiety, and a behavior discharges it — temporarily. Examiners test whether you can separate the obsession from the compulsion, and recognize the related disorders that share the pattern.

Obsessions are recurrent, intrusive, unwanted thoughts, urges, or images that cause marked anxiety (contamination fears, doubts, taboo thoughts, need for symmetry). They are cognitive — the input. Compulsions are repetitive behaviors or mental acts the person feels driven to perform in response to an obsession or according to rigid rules (hand-washing, checking, counting, ordering, silent praying). They are the output, aimed at reducing distress or preventing a feared event, but are not realistically connected or are clearly excessive. Obsession = the itch; compulsion = the scratch.

For OCD, obsessions and/or compulsions are time-consuming (more than 1 hour/day) or cause significant distress/impairment. A degree-of-insight specifier ranges from good insight to absent insight/delusional beliefs.

Two related disorders to know at overview level. Body dysmorphic disorder (BDD): preoccupation with perceived flaws in physical appearance that are not observable or appear slight to others, plus repetitive behaviors (mirror-checking, grooming, reassurance-seeking, skin-picking) or mental comparing. Hoarding disorder: persistent difficulty discarding possessions regardless of value, due to a perceived need to save them and distress at parting, resulting in accumulated clutter that congests living spaces and impairs use of the home.

Clinical Pearl: Obsessions are intrusive thoughts (the trigger); compulsions are repetitive behaviors/mental acts done to relieve them (the response). OCD becomes a diagnosis when they consume more than an hour a day or impair functioning. BDD = obsession with appearance flaws; hoarding = can't discard possessions.

Cheat sheet

NCE · Areas of Clinical Focus

Obsessive-compulsive & related disorders

OCD is diagnosed when the obsessions and/or compulsions are time-consuming — more than 1 hour a day — or cause significant distress or impairment; either qualifier alone satisfies the gate.

01 · Don't confuseObsession trigger, compulsion response

02 · Know the termOCD gate: 1 hour or impairment

03 · Must knowBDD: perceived appearance flaw

Criteria & key terms

BDD: perceived appearance flaw must knowBody dysmorphic disorder is preoccupation with a perceived flaw in physical appearance that is unobservable or appears slight to others, accompanied by repetitive behaviors such as mirror-checking, grooming, reassurance-seeking, skin-picking, or mental comparing.

Hoarding: difficulty discarding must knowHoarding disorder is persistent difficulty discarding possessions regardless of their value, driven by a perceived need to save them and distress at parting, producing accumulated clutter that congests living spaces and impairs use of the home.

Obsessions: intrusive, unwantedObsessions are recurrent, intrusive, unwanted thoughts, urges, or images that cause marked anxiety — contamination fears, doubts, taboo thoughts, or a need for symmetry — and they are cognitive, the input to the loop.

Compulsions include mental acts such as counting or silent praying, not only observable behaviors such as washing, checking, or ordering; what makes an act a compulsion is that the person feels driven to perform it in response to an obsession or according to rigid rules.

Compulsions unrealistic or excessiveCompulsions are aimed at reducing distress or preventing a feared event, but they are not realistically connected to what they are meant to prevent, or they are clearly excessive.

OCD insight specifierOCD carries a degree-of-insight specifier running from good or fair insight through poor insight to absent insight or delusional beliefs, so delusional conviction about the feared outcome does not move the case out of the OCD family.

Applying it on the exam

Assess time and impairmentWhen a client describes repetitive rituals, the counselor's differentiating step is to establish how much time they consume each day and how they impair functioning, because that is the gate that separates OCD from a habit or a preference for order.

Obsessions vs compulsions

Commonly confused

	Obsessions	Compulsions
Role in the loop	Trigger: raises anxiety	Response: lowers anxiety
Form	Thoughts, urges, images	Behaviors or mental acts
Examples	Contamination, doubt, taboo thoughts, symmetry	Washing, checking, ordering, counting, praying
Defining quality	Intrusive and unwanted	Driven; not realistically connected or clearly excessive

More detail

Show 2 reference facts

Related disorders covered hereBody dysmorphic disorder and hoarding disorder are obsessive-compulsive related disorders; they are not the only members of the DSM-5-TR chapter.

The itch-and-scratch loopThe whole family runs on one loop: the unwanted thought spikes anxiety and the behavior discharges it only temporarily — the obsession is the itch and the compulsion is the scratch.

Pearl

The obsession is the itch and the compulsion is the scratch, and the relief never lasts.

Built from CaseSavvy's verified NCE fact map for this topic (11 facts, verified 2026-10-21).

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Areas of Clinical Focus

In obsessive-compulsive disorder, what distinguishes an obsession from a compulsion?

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