4 Classification and assessment in psychiatry4.1 Descriptive psychopathology
4.1.1 Fundamental concepts in psychopathology
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Written by Resident Doctor Committee · Published
New in the 2027 syllabus
The College added this topic for exams from January 2027.
Describing before explaining
Psychopathology is the study of abnormal experience, thinking (cognition), emotion and behaviour. Descriptive psychopathology sets out the features of these experiences without first assuming a cause.
A symptom is something the person reports. A sign is something the clinician observes or elicits. Both need interpreting in context.
A syndrome is a recognisable cluster of findings. It may have several causes, so it does not necessarily point to a single disease.
Distinction | What it means | Example |
|---|---|---|
Form and content | The type of experience versus what it is about | A persecutory delusion has delusional form and threatening content |
Subjective and objective | What the person reports versus what the clinician observes | Reported sadness versus observed tearfulness |
State and trait | How the person is now versus a fairly lasting tendency | Acute suspiciousness versus longstanding mistrust of other people |
Primary and secondary delusions | Arising with no understandable mental event before it versus developing from another experience | A delusional explanation following a frightening hallucination |
Establishing the phenomenon
Start with the person's own words. Ask for an example, then clarify timing, how convinced they are, whether they feel in control, how distressing it is and how it affects what they do.
Meaning depends on language, culture, developmental stage and shared beliefs. An unfamiliar belief is not automatically a delusion.
Context and function help you tell a symptom from normal variation. Distress should not be the only test of whether something is a disorder.
Longitudinal information shows onset, fluctuation and change from the person's baseline. A single interview cannot give you this.
Common errors
Mixing inference with observation. "Looked towards the door repeatedly" is an observation. "Feared persecution" is an inference, and it needs the person's account or other evidence.
Diagnosing from one phenomenon. A single finding rarely establishes a diagnosis. Assess the wider syndrome, medical causes, substances and any change in functioning.
Taking absence at interview as true absence. If something does not appear during the interview, that does not prove it is absent outside it, especially when experiences fluctuate or the person is reluctant to disclose them.
Explaining before describing. Description comes first. Biological, cognitive, behavioural and psychodynamic models may explain the same accurately described experience in different ways.