Thought & Speech

Compulsion

A compulsion is a repetitive action carried out in response to an obsessional urge, image, or thought — in effect, an obsessional motor act. It may follow directly from an obsessional impulse to act, or it may be mediated by an obsessional thought, such as a fear of contamination leading to repeated hand-washing.

This has traditionally been understood as functionally inseparable from obsession rather than as a wholly distinct phenomenon: a compulsion is what an obsessional urge or fear looks like once it is translated into action, which is why the two are always discussed together even though they are conventionally distinguished by name.

Recognition features

• A repetitive action or ritual that the person feels driven to carry out
• Usually linked to an identifiable obsessional thought, image, fear, or impulse that precedes or accompanies it
• The person generally recognises the behaviour as excessive or unreasonable, even while feeling compelled to perform it
• Resisting the urge to carry out the action typically produces significant anxiety, which the action itself temporarily relieves

Eliciting it at interview

• Ask concretely about repetitive behaviours: "Do you find yourself having to check, wash, count, or arrange things over and over, even when part of you knows it isn't necessary?"
• Explore the link to an underlying obsessional thought or fear, since this connection is usually present and clinically informative
• Ask what happens if the action is prevented or delayed, since a rise in anxiety that eases once the action is completed is a characteristic pattern

Distinguishing features

• Differs from an obsession in being the behavioural, motor expression of the underlying urge or fear, rather than the thought or urge itself
• Differs from a catatonic mannerism or stereotypy, which is not typically linked to an identifiable preceding obsessional thought or to anxiety relief in the same way
• The person's own recognition that the act is excessive, together with the anxiety-driven quality of the urge to perform it, distinguishes a compulsion from a habitual or culturally sanctioned ritual

Common misconceptions

• That compulsions are simply unusual habits or preferences; they are typically driven by significant anxiety and are experienced as difficult or distressing to resist
• That every compulsion is visible or dramatic; some compulsive acts, such as silently repeating a phrase or mentally counting, are entirely internal and easy to miss unless asked about directly

Related phenomena

Obsession · Disturbance of the Boundaries of the Self

Diagnostically relevant to

Obsessive-Compulsive Disorder (links open the DSM-5 Learning Lab)

Practice this

A patient feels driven to check that the front door is locked exactly seven times before he can leave the house, recognising the behaviour as excessive and unreasonable, but experiencing significant anxiety if he tries to resist it, anxiety that is relieved once he completes the checking. What is this? · A patient describes recurrent, intrusive thoughts that he might have left the stove on, causing him significant distress and preoccupation throughout the day, but he does not actually go and check the stove or perform any related action in response. Before revealing the answer: is this a compulsion? · A patient describes a repetitive urge and an accompanying repetitive action. Before revealing the answer, decide what distinguishes a compulsion from an obsession. · A patient mentions performing a repetitive action many times a day. Before revealing the answer, decide how you would explore whether this is a compulsion. · Explain why resistance to a compulsion typically produces anxiety that the compulsive act itself then relieves, and why this pattern matters clinically.

Illustration

A 30-year-old man describes needing to check that his front door is locked exactly seven times before he can leave for work, explaining that if he is interrupted partway through the sequence he must start again from the beginning, and that skipping the ritual entirely leaves him consumed by anxiety for the rest of the day, even though he knows the door was locked the first time.

References

• Casey, P. & Kelly, B. (2019). Fish's Clinical Psychopathology, 4th ed. Ch. 4, 'Disorders of Thought and Speech'.