Psychotic Disorders
Schizophrenia dominates teaching on psychosis, which produces two errors. It leads students to treat psychosis as though it were a single diagnosis, and it leads them to equate treating the illness with abolishing hallucinations.
Two ideas correct both.
Psychosis is a syndrome with many causes, and organic and substance-induced causes must be excluded before a primary psychiatric diagnosis is made. A first psychotic episode is an indication for investigation, not only for an antipsychotic.
The symptoms that respond best to treatment are not the ones that determine outcome. Antipsychotics reliably reduce hallucinations and delusions. They do far less for the negative and cognitive symptoms, and it is those that predict whether a patient will work, study, live independently and maintain relationships.
A third principle governs prognosis and is the strongest argument for early detection. The longer psychosis goes untreated, the worse the eventual outcome, an association robust enough that reducing the duration of untreated psychosis is a service objective in its own right.
1. Describing the Symptoms Precisely
Phenomenology matters here more than anywhere else in psychiatry, because the terms are not interchangeable.
A delusion is a fixed false belief, held with conviction, out of keeping with the person's cultural and educational background, and not amenable to reasoning.
The cultural clause is essential. A belief shared by a person's community is not a delusion, however implausible it may seem to the clinician, which is why possession beliefs and beliefs about the evil eye require assessment in context rather than automatic pathologising.
A hallucination is a perception without an external stimulus, experienced in external space with the full force of a real perception. An illusion is a misperception of a real stimulus. A pseudohallucination is experienced in inner space and recognised as arising from the mind.
Modality tells you where to look
| Hallucination type | Suggests |
|---|---|
| Auditory | Schizophrenia and primary psychosis |
| Visual | Organic cause, delirium, substance use or withdrawal |
| Tactile, formication | Cocaine or amphetamine use, alcohol withdrawal |
| Olfactory or gustatory | Temporal lobe epilepsy, structural lesion |
Prominent visual hallucinations should prompt a search for an organic cause, which is one of the most useful discriminators available at the bedside.
2. Positive, Negative and Cognitive Symptoms
Positive symptoms are additions to normal experience: delusions, hallucinations, formal thought disorder and disorganised behaviour.
Negative symptoms are subtractions: blunted affect, alogia, avolition, anhedonia and asociality.
Cognitive symptoms affect attention, working memory and executive function.
The clinical significance of the division is that antipsychotics act principally on positive symptoms, while negative and cognitive symptoms respond poorly and correlate far better with long-term functioning.
Negative symptoms are also routinely misattributed. They are mistaken for depression, for laziness, or for medication side effects, and distinguishing primary negative symptoms from those secondary to depression, to antipsychotic-induced parkinsonism or to institutional understimulation is a genuine clinical task rather than an academic one.
Schneider's first-rank symptoms
Thought insertion, withdrawal and broadcasting; delusional perception; third-person auditory hallucinations discussing the patient; running commentary; and passivity phenomena in which actions, feelings or impulses are experienced as externally controlled.
They are characteristic but not diagnostic, since they occur in mania and in organic states, and modern classifications no longer give them the weight they once had. Their real value is descriptive precision.
3. Schizophrenia
Diagnosis requires characteristic symptoms with significant functional impairment, persisting for at least six months in DSM criteria or one month of active symptoms in ICD criteria, with organic and substance causes excluded.
Onset is typically in late adolescence to the twenties, and earlier in men than in women by several years, with women showing a second smaller peak after middle age.
Prognosis
The features associated with better outcome are worth learning as a set, because they recur in examinations and they genuinely inform counselling.
Better outcome: acute onset, clear precipitant, later age of onset, prominent affective symptoms, good premorbid functioning, being married, female sex, short duration of untreated psychosis, and good treatment adherence.
Worse outcome: insidious onset, early age of onset, prominent negative symptoms, poor premorbid adjustment, social isolation, substance misuse and long duration of untreated psychosis.
Roughly a fifth to a quarter of patients have a single episode with good recovery, which is worth stating because the prevailing assumption of uniform deterioration is inaccurate and affects how families are counselled.
Interestingly, outcomes reported from India and other lower-income settings in international studies have been better than those in high-income countries, with family involvement and continued social role often cited as contributors.
4. Other Psychotic Disorders
| Disorder | Distinguishing feature |
|---|---|
| Brief psychotic disorder | Under one month, often with acute stress, full recovery |
| Schizophreniform disorder | One to six months |
| Schizoaffective disorder | Psychosis with prominent mood episodes; psychosis persists for two weeks without mood symptoms |
| Delusional disorder | A single circumscribed delusional system with otherwise preserved functioning |
| Shared psychotic disorder | Delusion transferred to a close contact, resolving on separation |
Delusional disorder is easily underestimated. The patient functions normally outside the delusional system, holds a job, and can appear entirely well until the specific topic arises, which is why these patients present late and often through legal or occupational routes rather than clinically.
Acute and transient psychotic disorders are relatively more frequent in Indian practice than in Western series, typically with abrupt onset, a polymorphic and rapidly changing picture, frequent precipitating stress and good recovery.
5. Excluding Organic Causes
A first psychotic episode requires systematic exclusion of secondary causes before a primary diagnosis is fixed.
Features that point away from a primary psychiatric illness are prominent visual hallucinations, fluctuating consciousness, disorientation, abnormal vital signs, focal neurological signs, onset after 40, and a rapid onset over hours to days.
Substance-related causes include cannabis, amphetamines, cocaine, alcohol withdrawal and corticosteroids. Medical causes include delirium of any cause, temporal lobe epilepsy, autoimmune encephalitis, thyroid disease, systemic lupus erythematosus, HIV, neurosyphilis, vitamin B12 deficiency and Wilson disease.
Delirium is the single most important differential, and the distinguishing feature is consciousness. Delirium fluctuates, impairs attention and orientation, and is worse at night. Schizophrenia occurs in clear consciousness.
Anti-NMDA receptor encephalitis deserves specific mention, because it presents as a first psychotic episode in a young person, often with a prodromal viral-like illness, followed by seizures, movement disorder and autonomic instability, and it is treatable.
6. Aetiology and Risk
No single cause explains schizophrenia, and the useful framework is that a genetic vulnerability interacts with environmental exposures acting on a developing brain.
Heritability is high but inheritance is not simple. Risk in the general population is around one per cent, rising to roughly ten per cent in a first-degree relative and to around fifty per cent in a monozygotic twin. That concordance falling well short of a hundred per cent is the clearest evidence that genes alone are not sufficient.
The neurodevelopmental hypothesis holds that the disorder originates in disrupted early brain development, with symptoms emerging only when the affected circuits are called upon in adolescence and early adulthood. Obstetric complications, maternal infection and winter birth are the classic supporting associations.
Cannabis is the environmental exposure with the strongest and most examinable evidence, and the association is dose-related, stronger with early adolescent use and with high-potency preparations, and stronger in those with genetic vulnerability.
Migration and urban upbringing are consistently associated with raised incidence, which is generally interpreted as social adversity and chronic social defeat acting on vulnerability rather than as anything intrinsic to either.
The dopamine hypothesis remains the pharmacological anchor, with excess mesolimbic dopaminergic signalling producing aberrant salience, but glutamatergic models involving NMDA receptor hypofunction better explain negative and cognitive symptoms, which is why phencyclidine and ketamine reproduce those features while amphetamine reproduces only the positive ones.
7. Formal Thought Disorder and Catatonia
Disordered thinking
Formal thought disorder is a disturbance of the structure of thought rather than its content, inferred from speech.
Loosening of associations, in which ideas shift with no discernible connection, is the classic finding. Tangentiality answers obliquely and never returns to the point, while circumstantiality wanders but eventually arrives. Neologisms are invented words, and thought block is an abrupt cessation mid-sentence with loss of the thread.
The distinction from flight of ideas in mania is worth holding. In flight of ideas the connections between thoughts are present but rapid, often through rhyme or punning, so a listener can follow the links. In loosening of associations the links are absent.
Catatonia
Catatonia is a psychomotor syndrome rather than a subtype of schizophrenia, and it is now recognised to occur more often in mood disorders and in organic illness than in schizophrenia.
Its features include immobility, mutism, negativism, posturing, waxy flexibility, echolalia and echopraxia, and at the other extreme excitement and stereotypy.
Two points make it clinically urgent. Malignant catatonia, with fever and autonomic instability, is life-threatening and closely resembles neuroleptic malignant syndrome. And catatonia responds dramatically to benzodiazepines, with a lorazepam challenge both diagnostic and therapeutic, while electroconvulsive therapy is the treatment when benzodiazepines fail.
The practical trap is that antipsychotics may worsen catatonia and can precipitate the malignant form, so the reflex to treat a mute, immobile psychotic patient with an antipsychotic is precisely wrong.
8. Treatment and the Legal Framework
Antipsychotics are the mainstay, chosen on adverse effect profile rather than on efficacy, since efficacy is broadly comparable apart from clozapine.
Clozapine is indicated after failure of two adequate antipsychotic trials, and delaying it is a common and consequential error.
Long-acting injectable formulations address the commonest cause of relapse, which is non-adherence, and they should be offered rather than reserved for the most unwell.
Psychosocial treatment is not optional. Family intervention reduces relapse, particularly where expressed emotion is high, and supported employment outperforms sheltered work.
High expressed emotion in the family, meaning criticism, hostility and emotional overinvolvement, predicts relapse independently of medication, which is why involving families in treatment is a therapeutic intervention rather than a courtesy.
The Mental Healthcare Act 2017
Indian law changed substantially, and the provisions are examinable.
Advance directives allow a person to specify how they wish to be treated, and how they do not, in the event of future incapacity.
A nominated representative may be appointed by the person to act on their behalf.
Mental Health Review Boards provide oversight of admissions and adjudicate complaints.
The Act establishes a right to access mental healthcare and prohibits several practices, including the use of electroconvulsive therapy without anaesthesia and its use in minors without additional safeguards.
Section 115 presumes severe stress in anyone who attempts suicide, removing criminal liability and placing a duty on government to provide care and rehabilitation.
The intent throughout is a shift from a custodial framework to a rights-based one, and the widely acknowledged difficulty is uneven implementation rather than the content of the law.
9. Worked Examples
Example 1. A 19-year-old is brought with three days of agitation, visual hallucinations of insects, and disorientation that is worse at night. He is febrile. What is the most likely diagnosis?
This is delirium until proved otherwise, not a first episode of schizophrenia.
Four features point away from a primary psychotic illness: prominent visual hallucinations rather than auditory ones, disorientation, fluctuation with worsening at night, and fever indicating a physical cause. Schizophrenia occurs in clear consciousness with preserved orientation.
Management is to search for the cause with full examination, blood count, cultures, glucose, electrolytes, renal and liver function, toxicology and, where indicated, imaging and lumbar puncture, while treating agitation with the minimum necessary sedation. Giving an antipsychotic and admitting him to a psychiatric bed without investigation risks missing a treatable and potentially fatal illness.
Example 2. A 22-year-old man has had two years of gradually declining function, has stopped attending college, sits alone and speaks little, with no hallucinations or delusions. His family describe him as lazy. How do you interpret this?
This is likely to be the negative symptom syndrome of schizophrenia, comprising avolition, alogia, blunted affect and asociality, and it may have been preceded by an unnoticed or brief positive phase.
The interpretation matters because negative symptoms are routinely attributed to laziness or poor character, which delays diagnosis by years and is itself damaging to the family relationship.
The clinical task is to distinguish primary negative symptoms from their mimics: depression, which carries pervasive low mood, guilt and hopelessness; antipsychotic-induced parkinsonism, which adds bradykinesia and rigidity; and understimulation from an impoverished environment.
The prognostic implication is significant, since prominent negative symptoms and insidious onset both predict worse outcome, and antipsychotics do relatively little for them, so psychosocial intervention and supported employment carry proportionally greater weight.
Example 3. A 45-year-old man has believed for three years that a colleague is stealing his research. He works normally, has no hallucinations, and functions well in every other respect. What is the diagnosis and why is it easily missed?
Delusional disorder, characterised by a single circumscribed delusional system with preserved functioning outside it.
It is missed because the patient does not look unwell. There is no thought disorder, no hallucination, no self-neglect and no functional decline, so the belief is often taken at face value by colleagues and clinicians alike, particularly where it concerns something plausible such as workplace conflict or infidelity.
These patients typically come to attention through occupational or legal routes, after complaints, litigation or confrontation, rather than by seeking psychiatric help, since they see the problem as external rather than internal.
Assessment requires careful separation of a delusion from a justified belief, which sometimes means seeking collateral evidence, and treatment is difficult because insight is absent and engagement is poor.
Example 4. A patient with schizophrenia has failed adequate trials of two antipsychotics over two years. The team plans a trial of a third. Comment.
The plan is defensible only if the previous trials were genuinely inadequate. Failure of two adequate trials, each at a therapeutic dose for a sufficient duration with confirmed adherence, defines treatment resistance and is the indication for clozapine.
Clozapine is the only antipsychotic with established superiority in this situation, and it additionally reduces suicide risk. A third conventional trial has a low probability of response and postpones the only intervention likely to work.
Before starting clozapine, adherence should be verified, since apparent resistance is frequently covert non-adherence, and a long-acting injectable is a reasonable way to establish this. Substance use and inadequate dosing should be excluded for the same reason.
The counterargument that clozapine is burdensome is real but is usually given too much weight, since delay in a patient with active psychosis reduces the eventual chance of response.
Example 5. A family are frustrated with a young man with schizophrenia and are highly critical of him, telling him repeatedly to make more effort. He has relapsed twice this year despite taking medication. What is the relevance?
This is high expressed emotion, comprising criticism, hostility and emotional overinvolvement, and it predicts relapse independently of medication adherence.
The relevance is therapeutic rather than merely descriptive. Family intervention that reduces expressed emotion, by providing education about the illness, reframing negative symptoms as illness rather than character, teaching communication and problem-solving, and supporting the carers themselves, has been shown to reduce relapse rates substantially.
It also reframes the family's frustration accurately. Criticism of avolition assumes the patient could try harder, and understanding avolition as a symptom removes both the accusation and the guilt.
Practically, this patient needs family intervention alongside optimised medication, and treating the medication as the only variable would leave the strongest modifiable predictor of relapse untouched.
Summary
Psychosis is a syndrome, so exclude organic and substance causes before diagnosing.
Antipsychotics treat positive symptoms; negative and cognitive symptoms decide outcome.
Longer duration of untreated psychosis predicts worse eventual outcome.
A delusion must be out of keeping with cultural background, which protects against pathologising shared beliefs.
Hallucinations occur in external space; pseudohallucinations in inner space.
Prominent visual hallucinations suggest an organic cause.
Olfactory hallucinations suggest temporal lobe pathology.
First-rank symptoms are characteristic but not diagnostic.
Negative symptoms are misread as laziness, depression or drug side effects.
Schizophrenia begins earlier in men than in women.
Acute onset, precipitant, affective symptoms and good premorbid function predict better outcome.
A fifth to a quarter of patients have a single episode with good recovery.
Delusional disorder preserves function outside the delusional system and presents late.
Delirium is the key differential, distinguished by fluctuating consciousness and impaired attention.
Anti-NMDA receptor encephalitis presents as first-episode psychosis and is treatable.
Clozapine follows failure of two adequate trials, and delaying it is a consequential error.
Long-acting injectables address non-adherence, the commonest cause of relapse.
High expressed emotion predicts relapse independently of medication.
The Mental Healthcare Act 2017 introduced advance directives, nominated representatives and review boards.
Section 115 removed criminal liability for attempted suicide and created a duty to provide care.
