Psychiatric assessment and the mental state examination
The examination that has no instruments — only what you notice and how you record it.
Every other clinical examination in this syllabus has something to hold: a stethoscope, an ophthalmoscope, a tendon hammer. The mental state examination has none, which makes students treat it as vague. It is not. It is a structured observation with defined components, performed in a fixed order, and recorded in language precise enough for a colleague reading it tomorrow to picture the patient.
Its distinguishing feature is that it describes now. The history tells you what has happened over weeks or years; the mental state tells you what is happening in this room, and it can change between the morning and the afternoon. That is precisely why it is repeated and dated at each contact.
🩺 Where this lives: The phrase "poor historian" in a set of notes almost always describes the interview rather than the patient. People give unclear accounts when they are frightened, in pain, confused, ashamed, speaking a second language, or being hurried by someone who has already decided the diagnosis. Writing that a patient is a poor historian closes the question; writing what they actually said, and under what conditions, leaves it open for the next clinician. The same applies to "aggressive", "difficult" and "non-compliant" — each is a label that ends thinking rather than a description that supports it.
💡 A note on scope. This chapter covers how to conduct and record the assessment. Risk assessment is covered in full in the Delirium and Risk Assessment chapter and is referenced rather than repeated; the individual disorders are in their own chapters; and capacity, consent and confidentiality in the Ethics chapter. It gives no cognitive screening scores or cut-offs — several instruments are in use, they differ, and some carry copyright restrictions, so the chapter names the domains tested and directs you to the tool in local use. No doses.
History and mental state are different things
Students routinely merge these, and the result is a note in which nobody can tell what was reported and what was observed. The history is largely what you are told — the presenting problem, its course, past episodes, family history, personal and social background, substance use, forensic history. The mental state examination is largely what you observe during the interview. Keeping them separate matters because a patient may report feeling fine while appearing profoundly withdrawn, and that discrepancy is itself the clinical finding.
The components
WORKING THROUGH THE MENTAL STATE
APPEARANCE AND BEHAVIOUR
Self-care and dress, whether they are engaged or
withdrawn, eye contact, psychomotor activity — retarded
or agitated — abnormal movements, and rapport. Much of
this is gathered before a single question is asked.
SPEECH
Rate, volume, quantity, spontaneity and flow. Describe
the FORM of speech here; what they say belongs under
thought content.
MOOD AND AFFECT
MOOD is subjective — what the patient reports, ideally in
their own words. AFFECT is objective — what you observe,
and how it varies during the interview. Note whether
affect is congruent with what is being described.
THOUGHT
FORM — how thinking flows and connects.
CONTENT — delusions, obsessions, preoccupations, and
thoughts of harm to self or others.
PERCEPTION
Hallucinations and illusions, and crucially in WHICH
MODALITY — auditory hallucinations point one way,
visual ones towards an organic cause (see the psychosis
chapter).
COGNITION
Orientation, attention, concentration and memory. Use the
screening tool in local practice.
INSIGHT
Does the patient believe anything is wrong, do they
attribute it to illness, and would they accept help? It
is not all-or-nothing — record what they actually
believe.
RISK
To self, to others, and FROM others — including
vulnerability, exploitation and self-neglect. Never
omitted, and covered fully in the risk assessment
chapter.
Form and content
💡 Exam angle: the form versus content distinction is examined repeatedly because it is genuinely useful. A delusion is disordered content — the belief itself is abnormal, but it may be expressed in perfectly organised sentences. Loosening of associations or flight of ideas is disordered form — the ideas may each be ordinary but they do not connect. A patient can show either without the other. The same logic separates mood (reported) from affect (observed).
Describing rather than labelling
The test of a good mental state record is whether a colleague who has never met the patient can picture them from it. "Agitated" conveys almost nothing; "paced the room, would not sit, raised voice when asked about his brother, settled when offered tea" conveys the situation, the trigger and what helped. Quote the patient's own words wherever the content matters — a direct quotation survives reinterpretation in a way that a summary does not.
Conducting the interview
PRACTICAL POINTS THAT CHANGE WHAT YOU ARE TOLD
SAFETY FIRST, AND WITHOUT DRAMA
Sit nearer the door than the patient, know where the exit
is, tell a colleague where you are, and do not interview
alone if there is any concern. Arranging this quietly
does not damage rapport; being frightened mid-interview
does.
OPEN QUESTIONS FIRST
Begin broadly and narrow later. Tolerate silence — people
disclose most in the pauses, and an early interruption
usually closes the most useful line of enquiry.
ASK THE DIFFICULT QUESTIONS DIRECTLY
Self-harm and suicidal thoughts, hearing voices,
substance use, abuse. Asking does NOT plant the idea, and
indirect questioning produces uninterpretable answers.
See the risk assessment chapter.
SEEK A COLLATERAL HISTORY
From family, friends and previous records — particularly
where insight is impaired or the account is incomplete.
Attend to consent and confidentiality, and note that
seeking information to protect someone at serious risk is
among the recognised exceptions (see the Ethics chapter).
BE ALERT TO CULTURE AND LANGUAGE
Use a proper interpreter rather than a relative where
possible, and remember that a belief shared by the
patient's community is not a delusion — a point made in
full in the psychosis chapter.
AND ALWAYS CONSIDER THE PHYSICAL
A physical examination and basic investigations are part
of a psychiatric assessment, not an afterthought. Check
the glucose. Delirium, thyroid disease, infection and
substance withdrawal all present psychiatrically.
Clinical reasoning: four scenarios
🔍 Case 1 — the note nobody can use
ScenarioAn entry reads in full: "Patient aggressive and psychotic. Poor historian. For psychiatry review." The next clinician has no idea what was seen.
ProblemThree labels and no observations.
Reasoning"Aggressive" does not say what he did or what preceded it. "Psychotic" does not say whether there were delusions, hallucinations or disorganised speech. "Poor historian" usually describes a difficult interview rather than the patient.
AnswerRecord behaviour, speech, mood and affect, thought form and content, perception, cognition, insight and risk — describing what was observed and quoting what was said.
🔍 Case 2 — saying one thing, showing another
ScenarioA man says he feels "completely fine" and denies any problem. He is unkempt, makes no eye contact, speaks in a flat monotone with long pauses, and has lost considerable weight.
Key findingThe discrepancy itself.
ReasoningMood is what he reports; affect is what you observe, and here they are markedly incongruent. Recording both separately preserves the finding — merging them loses it entirely.
AnswerDocument reported mood in his own words alongside observed affect and behaviour, seek a collateral history, and assess risk directly.
🔍 Case 3 — organised speech, disordered belief
ScenarioA woman speaks fluently, coherently and in complete sentences, describing in detail how a broadcasting company is transmitting instructions to her through her television. A student records "no thought disorder".
ConfusionForm mistaken for content.
ReasoningHer thought form is indeed normal — the ideas connect logically. Her thought content is abnormal: this is a delusion. Recording "no thought disorder" without qualification obscures the central finding.
AnswerRecord form and content separately: normal form, delusional content, quoted in her own words. Then explore perception, insight and risk.
🔍 Case 4 — the assessment that skipped the body
ScenarioAn older man is referred with "acute psychiatric disturbance" — agitated, confused and seeing things. A full mental state examination is documented. No physical examination is performed and no glucose is checked.
OmissionThe physical assessment.
ReasoningFluctuating confusion with visual hallucinations in an older patient suggests delirium, which is a physical illness presenting psychiatrically. Hypoglycaemia, infection, drugs and withdrawal all do the same.
AnswerPhysical examination, observations and basic investigations including glucose are part of every psychiatric assessment. See the delirium chapter.
Commonly confused
Confusion
The distinction
Why it matters
History vs mental state
Reported over time versus observed now
Discrepancies between them are findings.
Mood vs affect
Subjective versus objective
Incongruence is clinically significant.
Thought form vs content
How it flows versus what is believed
Either can be abnormal alone.
Labelling vs describing
"Agitated" versus what he actually did
Labels end thinking; descriptions support it.
"Poor historian" vs a poor interview
Usually the latter
It closes a question that should stay open.
Auditory vs visual hallucinations
Visual suggests an organic cause
Redirects the whole assessment.
Psychiatric vs physical assessment
Both are required
Delirium presents psychiatrically.
Cultural belief vs delusion
Is it shared by the community?
Mislabelling destroys trust.
Rapid revision
MUST-KNOW FACTS
1. The HISTORY is what has happened; the MENTAL STATE is what is happening NOW.
2. History is largely REPORTED; mental state is largely OBSERVED.
3. The MSE is the psychiatric equivalent of the physical examination.
4. It changes over hours — repeat and date it at each contact.
5. COMPONENTS: appearance and behaviour, speech, mood and affect.
6. Then thought, perception, cognition, insight — and RISK.
7. RISK is never omitted: to self, to others, and FROM others.
8. SPEECH describes the FORM; what is said belongs to thought content.
9. MOOD is what the patient REPORTS; AFFECT is what you OBSERVE.
10. Incongruence between mood and affect is itself a finding.
11. THOUGHT FORM is how thinking flows and connects.
12. THOUGHT CONTENT is what is believed — delusions, obsessions.
13. A delusion is abnormal CONTENT with possibly normal FORM.
14. Loosening of associations and flight of ideas are abnormal FORM.
15. Record the MODALITY of hallucinations.
16. VISUAL hallucinations suggest an ORGANIC cause.
17. INSIGHT is not all-or-nothing — record what they actually believe.
18. DESCRIBE what you see rather than labelling it.
19. QUOTE the patient's own words.
20. "POOR HISTORIAN" usually describes the interview, not the patient.
21. A colleague should be able to picture the patient from your notes.
22. SAFETY: sit nearer the door, tell someone, do not interview alone if concerned.
23. OPEN questions first, then narrow · tolerate silence.
24. ASK DIRECTLY about self-harm, voices and substance use.
25. Asking about suicide does NOT plant the idea.
26. Seek a COLLATERAL history, with attention to consent.
27. Use a proper INTERPRETER rather than a relative.
28. A belief shared by the patient's community is NOT a delusion.
29. PHYSICAL examination and basic tests are part of psychiatric assessment.
30. CHECK THE GLUCOSE.
31. Delirium, thyroid disease, infection and withdrawal present psychiatrically.
32. Use the cognitive screening tool in local practice.
💡 Exam angle: the reliable threads are the three separations — history from mental state, mood from affect, and form from content — plus the habit of describing rather than labelling. An answer that records what was observed and quotes what was said will outscore one that reaches for a diagnostic term.
Syllabus points
History versus mental state examination
Appearance, behaviour and speech
Mood versus affect
Thought form and thought content
Perception and recording the modality
Cognition and insight
Where risk sits in the assessment
Describing rather than labelling
Quoting the patient's own words
Safety when interviewing
Open questions and tolerating silence
Asking the difficult questions directly
Collateral history and interpreters
Why the physical assessment is part of it
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