What the MSE Is — and Why It's Examined
The Mental State Examination (MSE) is a structured snapshot of a patient's psychological state at the time of assessment. Unlike the psychiatric history (which explores what has happened over time), the MSE documents what you observe and elicit right now. It is the psychiatric equivalent of a physical examination.
The MSE is examined in OSCEs as a standalone station (perform an MSE on this patient), as part of a broader psychiatric history station, and in written stations asking you to document findings. Examiners look for:
- 1A systematic, complete structure
- 2Precise clinical language (not vague generalisations)
- 3The ability to distinguish closely related terms (mood vs affect, form vs content of thought)
💡 Tip
The MSE is performed throughout the entire consultation — not added at the end. You are observing appearance, behaviour, and speech from the moment the patient enters. By the time you reach specific questions, you have already gathered most of the data without the patient realising.
The 8 Components of the MSE
Appearance → Behaviour → Speech → Mood → Affect → Thought → Perception → Cognition → Insight
🧠 Mnemonic
A Beautiful Smile Makes All The People Cry Instantly
(Appearance, Behaviour, Speech, Mood, Affect, Thought, Perception, Cognition, Insight)
1. Appearance
Observe and document objectively — describe what you see, not what you infer.
- Age: Does the patient look their stated age, younger, or older?
- Build: Cachectic, overweight, normal
- Dress and grooming: Appropriately dressed? Clean? Dishevelled? Incongruous (e.g., wearing a winter coat in summer — suggests thought disorder)
- Hygiene: Evidence of self-neglect? (Important in depression, schizophrenia)
- Distinguishing features: Tattoos, piercings, scars (including self-harm scars — note without assumption)
- Eye contact: Sustained, poor, avoidant, or intense/staring
Example of good documentation:
"A 34-year-old man who appeared his stated age. Dressed in crumpled clothing that appeared unwashed, with poor personal hygiene noted. Maintained minimal eye contact throughout."
2. Behaviour
Describes psychomotor activity and engagement:
- Agitation / psychomotor agitation: Restlessness, unable to sit still, picking at clothing — seen in anxiety, mania, akathisia (antipsychotic side effect), hyperthyroidism
- Psychomotor retardation: Slowed movements and speech — seen in severe depression, hypothyroidism, catatonia
- Rapport: Cooperative and engaged, or guarded, hostile, suspicious?
- Mannerisms: Repetitive, purposeful movements (e.g., touching face)
- Stereotypies: Repetitive, purposeless movements — schizophrenia
- Catatonia: Stupor, waxy flexibility (limb held in position placed by examiner = echopraxia)
💎 Clinical Pearl
Akathisia is a distressing inner restlessness caused by antipsychotic medication, seen as an inability to sit still — patients may pace or rock. It is frequently missed and misdiagnosed as anxiety or agitation from the underlying illness. Ask directly: "Do you feel a sense of inner restlessness that makes you want to move?"
3. Speech
Assess rate, rhythm, volume, and form:
| Feature | Finding | Associated condition |
|---|---|---|
| Rate | Pressured (fast, driven) | Mania, anxiety, stimulant use |
| Slow, long latency | Depression, psychomotor retardation | |
| Volume | Loud | Mania |
| Soft, mumbled | Depression, psychosis | |
| Tone | Monotone, flat | Schizophrenia (negative symptom), depression |
| Fluency | Dysphasia | Organic brain pathology — always consider |
| Quantity | Poverty of speech (short, monosyllabic) | Depression, schizophrenia |
| Logorrhoea (excessive, difficult to interrupt) | Mania |
4. Mood
Mood is subjective — it is what the patient tells you they feel. Ask directly:
"How would you describe your mood? How have you been feeling in yourself over the past few weeks?"
Document using the patient's own words where possible:
"Patient describes mood as 'rock bottom' and 'like I'm underwater.'"
Characterise: depressed, elevated, anxious, irritable, euthymic (normal), dysphoric (unpleasant but not specifically low).
💡 Tip
Mood vs Affect: This distinction is frequently tested. Mood is the patient's subjective, sustained emotional state — what they tell you they feel. Affect is the objective, observable emotional expression — what you observe. A patient can have depressed mood but a reactive affect (smiles when talking about grandchildren). Document them separately.
5. Affect
Affect is objective — what you observe in the patient's emotional expression:
| Term | Definition |
|---|---|
| Euthymic | Normal range and reactivity |
| Depressed | Consistently sad, tearful |
| Elevated | Euphoric, inappropriately cheerful |
| Anxious | Tense, worried expression |
| Flat | Minimal emotional expression — schizophrenia (negative symptom) |
| Blunted | Reduced but not absent emotional expression |
| Labile | Rapidly shifting between emotions — mania, emotionally unstable PD |
| Incongruent | Affect doesn't match the content of what is being discussed (laughing while describing death) — schizophrenia |
Reactivity: Does the affect respond appropriately to the content of the conversation? (Normal = reactive; in severe depression or schizophrenia, affect may be unreactive)
6. Thought
This is the most complex component. Divide into form and content.
Form (How the patient thinks)
| Abnormality | Description | Example |
|---|---|---|
| Flight of ideas | Rapid, connected thought jumps — connection exists but is superficial (rhyme, pun) | Mania |
| Loosening of associations | Thoughts jump with no logical connection | Schizophrenia |
| Tangentiality | Answers veer off topic and never return | Psychosis, mania |
| Circumstantiality | Arrives at the point but via an excessively indirect route | Anxiety, mania |
| Thought block | Mid-sentence the train of thought suddenly stops | Schizophrenia |
| Perseveration | Repeating the same phrase or word repeatedly | Organic brain pathology, OCD |
| Neologisms | Invented new words | Schizophrenia |
| Word salad / derailment | Completely incoherent, random word combinations | Severe psychosis |
Content (What the patient thinks)
- Delusions — fixed, false, unshakeable beliefs that are out of keeping with cultural or religious norms
- Persecutory ("MI5 are following me")
- Grandiose ("I am the messiah")
- Reference ("The newsreader is speaking directly to me")
- Nihilistic ("My organs have rotted away") — Cotard's syndrome
- Jealous/morbid ("My partner is definitely unfaithful despite all evidence")
- Somatic ("There are worms under my skin")
- Overvalued ideas — intensely held beliefs that dominate thinking but are not fixed or unshakeable
- Obsessions — repetitive, intrusive, unwanted thoughts recognised by the patient as their own
- Suicidal ideation — active or passive; with or without a plan
⚠️ Red Flag
Always screen for suicidal ideation in the MSE. Ask directly: "Have you had any thoughts of harming yourself or ending your life?" A patient in distress will not be made more suicidal by being asked — the evidence is clear on this. Failing to ask in a psychiatric OSCE is a red flag for the examiner.
7. Perception
Perception abnormalities = false sensory experiences:
| Type | Definition | Cause |
|---|---|---|
| Hallucination | Perception without an external stimulus — feels real, located in external space | Psychosis, delirium, substance withdrawal, severe depression |
| Pseudohallucination | Perception without a stimulus — recognised as internally generated, not real | Less alarming; seen in PTSD, grief |
| Illusion | Misperception of a real external stimulus | Delirium, anxiety (e.g., shadow misperceived as a person) |
| Depersonalisation | Feeling detached from oneself ("I feel like a robot") | Anxiety, depression, dissociation |
| Derealisation | Feeling the world is unreal ("Everything looks like a dream") | Anxiety, depression |
Hallucinations by modality:
- Auditory — most common in schizophrenia. Third-person voices (commenting, discussing the patient) are particularly associated with schizophrenia (First Rank Symptoms)
- Visual — suggests organic pathology (delirium, drug intoxication, dementia) unless proven otherwise
- Olfactory — temporal lobe epilepsy, severe depression
- Tactile — alcohol withdrawal (formication = insects crawling on skin), cocaine use
- Command hallucinations — voices telling the patient to do something — always assess for safety risk
💎 Clinical Pearl
Ask about hallucinations sensitively: "Some people when they're going through a difficult time hear sounds or voices that other people can't hear — has anything like that happened to you?" This normalising framing increases disclosure without suggesting the answer.
8. Cognition
A brief cognitive assessment within the MSE. A full MMSE or MoCA may be requested separately.
| Test | What it assesses |
|---|---|
| Orientation | "What is today's date? What day is it? Where are we?" (Time, place, person) |
| Registration | Name three objects; ask the patient to repeat them immediately |
| Attention | Serial 7s (100, 93, 86…) or WORLD backwards |
| Recall | Ask for the three objects after 5 minutes |
| Language | Name two objects; repeat a phrase |
| Visuospatial | Copy intersecting pentagons |
In an MSE OSCE, you typically document a brief screen:
"Patient was oriented to time, place, and person. Registration and recall were intact. Attention was mildly reduced on serial 7s."
9. Insight
Insight is a spectrum — document it precisely:
| Level | Description |
|---|---|
| Full insight | Recognises they have a mental illness, understands treatment is needed, willing to engage |
| Partial insight | Accepts something is wrong but denies it is mental illness ("I just need sleep") |
| No insight | Denies any illness, refuses treatment ("There's nothing wrong with me") |
💡 Tip
Poor insight does not mean lack of capacity. A patient may lack insight into their illness yet still have capacity to make decisions about treatment — these are separate assessments. Similarly, a patient with full insight may lack capacity due to cognitive impairment. Never conflate the two in an exam answer.
How to Present the MSE
"On mental state examination, [patient's name] was a [age], [appearance]. Behaviour was [describe]. Speech was [rate/volume/form]. Subjectively, mood was [patient's words]. Objectively, affect was [describe], [reactive/unreactive], [congruent/incongruent with content]. Thought form was [normal/abnormal — specify]. Thought content included [suicidal ideation / delusions / obsessions or none elicited]. No abnormalities of perception were elicited [or: the patient described auditory hallucinations — specify]. Cognitively, the patient was [oriented/disoriented]. Insight was [full/partial/absent]."
Common Examiner Follow-Up Questions
"What is the difference between a delusion and an overvalued idea?"
"A delusion is a fixed, false, unshakeable belief that is out of keeping with the patient's cultural and religious background, maintained despite evidence to the contrary, and not amenable to reasoned argument. An overvalued idea is an intensely held belief that dominates the person's thinking and can cause significant distress or behavioural change, but is not completely unshakeable — the person retains some capacity to consider alternative views."
"The patient reports hearing voices — what questions would you ask next?"
"I would characterise the hallucinations fully: how many voices, male or female, familiar or unfamiliar, what they say, whether they speak in the second or third person, whether they comment on actions or discuss the patient in the third person (First Rank Symptoms of schizophrenia), and critically — whether they are command hallucinations telling the patient to harm themselves or others, as this is a direct safety concern."