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Histrionic personality disorder matters because the person's emotional displays are performed for an audience rather than reflecting a stable inner state. It is a Cluster B ('dramatic/erratic') personality disorder marked by excessive emotionality and a persistent need to be the centre of attention. For example, imagine a woman who bursts into dramatic tears over a minor delay, then switches to laughter minutes later once she has everyone's attention. In practice, that rapid, shallow shift in emotion, rather than its depth, is the clue to the diagnosis.

Core features include discomfort when not the centre of attention, inappropriately seductive or provocative behaviour, rapidly shifting and shallow expression of emotions, and a style of speech that is impressionistic and lacking in detail. Suggestibility, being easily influenced by others or by current fashion, and considering relationships more intimate than they actually are, are also typical. Take a patient who describes a first meeting with a new acquaintance as an instant, deep friendship after a single brief conversation. In practice, that tendency to overstate the closeness of relationships helps distinguish histrionic personality disorder from ordinary sociability.

• Two patients are both dramatic and attention-seeking. Which feature points to borderline rather than histrionic personality disorder?
• In the DSM-5 cluster grouping, histrionic personality disorder sits alongside which other disorders?
• What is the position on drug treatment for histrionic personality disorder itself?

• Narcissistic personality disorder, seeks attention through claims of superiority, unlike histrionic personality disorder's dramatic emotional display.
• Borderline personality disorder, identity disturbance and recurrent self-harm tied to abandonment fear, rather than histrionic personality disorder's shallow, theatrical emotion.
• Suggestibility, easily influenced by others or fashion, unlike the fixed convictions seen in delusionalRelating to a fixed false belief held with total conviction despite evidence against it.Read more → disorders.
• Histrionic personality disorder, emotional shifts are rapid and shallow, whereas a genuine mood episode's emotional state is sustained over days to weeks.

• Suggestibility is described in histrionic rather than borderline presentations.
• This mixes disorders drawn from three different clusters.
• Shallow, rapidly shifting affect is the histrionic pattern.
• Seductive presentation and attention-seeking are histrionic features.
• Overestimating intimacy in relationships is a histrionic feature.

• Extract the defining phenomenology, duration, severity and functional-impact clues.
• Match the pattern to the most specific diagnostic or assessment construct.
• Actively test the closest look-alike against the missing or contradictory clue.
• Choose the precise term rather than a broader category that is merely compatible.