Revise Diagnostic criteria for impulse control disorders for Cambridge 9990 (1.3.1)

Impulse Control Disorders (ICDs) are a class of psychiatric disorders characterised by a recurrent failure to resist an impulse, drive, or temptation to perform an act that is harmful to the individual or others. Although the person may consciously wish to resist, and may feel mounting tension before the act, they experience a sense of release, pleasure, or gratification upon completing it. In the DSM-5, these are categorised under 'Disruptive, Impulse-Control, and Conduct Disorders'. The key feature is the diminished ability to regulate one's own behaviour in response to a specific, compelling urge. This is distinct from premeditated criminal behaviour, as the primary motivation is the management of internal psychological states rather than external gain.

Kleptomania is defined by the recurrent failure to resist impulses to steal objects that are not needed for personal use or for their monetary value. A key diagnostic feature is the escalating sense of tension immediately before the theft, followed by feelings of pleasure, gratification, or relief at the time of committing it. The stealing is not committed to express anger or vengeance and is not in response to a delusion or hallucination. The items stolen are often of little value to the individual, who can typically afford to buy them. These items may be hoarded, discarded, returned secretly, or given away. The disorder is not diagnosed if the stealing is better explained by a manic episode or antisocial personality disorder.

Pyromania involves deliberate and purposeful fire setting on more than one occasion. Individuals with pyromania experience tension or affective arousal before the act. They demonstrate a fascination with, interest in, curiosity about, or attraction to fire and its situational contexts (e.g., paraphernalia, uses, consequences). Crucially, pleasure, gratification, or relief is felt when setting fires, or when witnessing or participating in their aftermath. The fire setting is not done for monetary gain, as an expression of sociopolitical ideology, to conceal criminal activity, to express anger or vengeance, or as a result of impaired judgment (e.g., in major neurocognitive disorder). It is a rare disorder and must be distinguished from more common reasons for arson.

A crucial skill is differentiating these disorders from non-pathological or criminal behaviours. Kleptomania is not simply shoplifting; shoplifting is motivated by a desire for the item or inability to afford it. In contrast, kleptomania is driven by an internal compulsion, with the stolen items often having no value to the person. Similarly, pyromania must be distinguished from arson. Most arson is committed for reasons like insurance fraud, revenge, or to conceal another crime. A pyromaniac, however, sets fires to relieve internal tension and experiences a deep, pathological fascination with fire itself. For both disorders, the diagnosis requires ruling out other mental health conditions, such as psychosis or mania, where similar behaviours might manifest but for different underlying reasons.