The theme does not determine the diagnosis. Clinicians look at timing, mood, sleep, substances, medications, physical symptoms, cognition, trauma, functioning, and whether psychosis persists outside a particular state.
It is common for several factors to occur together—for example, bipolar disorder plus sleep deprivation, PTSD plus substance use, schizophrenia plus depression, or dementia plus delirium. Early labels may change as the timeline becomes clearer.
Fever, seizure, severe headache, weakness, new confusion, fluctuating alertness, unusual movements, head injury, pregnancy/postpartum change, or sudden onset after a medication/substance change require urgent medical attention.
Psychosis may include delusions, hallucinations, disorganized speech or behavior, negative symptoms, cognitive changes, and sustained functional decline. Surveillance and thought-control themes can be prominent.
Clinicians examine: duration, decline from baseline, negative symptoms, thought disorder, and psychosis outside mood episodes.
One or more fixed beliefs may remain relatively circumscribed, with more preserved speech and functioning outside the direct effects of the delusion.
Clinicians examine: persistence, lack of prominent disorganization or negative symptoms, and whether functioning is otherwise preserved.
Major mood episodes and schizophrenia-spectrum psychosis both play substantial roles. Under DSM criteria, there must be a period of psychosis without a major mood episode.
Clinicians examine: a detailed longitudinal timeline rather than a single appointment.
Grandiose mission beliefs can appear during mania, often with reduced need for sleep, elevated or irritable mood, pressured speech, racing thoughts, high energy, impulsivity, and risky goal-directed behavior.
Clinicians examine: whether psychosis occurs only during manic or depressive episodes.
Surveillance or investigation beliefs may center on guilt, deserved punishment, ruin, or imagined crimes. Severe depression, slowed or agitated movement, loss of appetite, and suicide risk may be prominent.
Clinicians examine: whether psychosis is confined to the depressive episode and whether urgent suicide prevention is needed.
Psychosis begins suddenly and resolves within a limited period, with return toward baseline. A definitive diagnosis often requires follow-up because some first episodes later fit another condition.
Clinicians examine: duration, recovery, stressors, substances, medical causes, and recurrence.
Trauma can produce hypervigilance, mistrust, flashbacks, dissociation, and intense threat expectations. Some people also experience psychotic symptoms that persist outside trauma re-experiencing.
Important: factual stalking and coercive control must be considered rather than automatically labeled psychosis.
Longstanding mistrust, hostile interpretations, ideas of reference, unusual perceptions, or magical thinking may exist without sustained full-threshold psychosis.
Clinicians examine: lifelong pattern, degree of insight, breadth of impairment, cultural context, and emergence of fixed delusions.
Brief stress-related paranoia or dissociation may occur during intense interpersonal crises and often reduces as the crisis settles.
Clinicians examine: relationship to abandonment fear, emotional arousal, duration, and return of insight.
A positive drug screen or a known medical condition does not automatically prove causation; the timeline, examination, and follow-up still matter.
Methamphetamine, cocaine, synthetic cathinones, high-potency cannabis, synthetic cannabinoids, PCP, hallucinogens, and withdrawal from alcohol or sedatives can produce paranoia, hallucinations, agitation, and dangerous medical complications.
Emergency signs: overheating, chest pain, seizure, severe agitation, dehydration, or withdrawal symptoms.
Corticosteroids, dopamine-enhancing medicines, anticholinergic drugs, some antimicrobials, and other treatments can contribute to psychosis or delirium in susceptible people.
Action: contact a prescriber urgently; do not abruptly discontinue essential medication without medical guidance.
Seizure disorders, brain tumors, stroke, traumatic brain injury, multiple sclerosis, autoimmune encephalitis, and other neurological conditions can present with psychiatric symptoms.
Red flags: focal weakness, seizure, movement disorder, catatonia, autonomic instability, abrupt cognitive decline, or unusual age of onset.
Thyroid disease, severe electrolyte or glucose disturbance, liver or kidney failure, porphyria, vitamin deficiencies, HIV, neurosyphilis, encephalitis, and other conditions can alter reality testing.
Action: medical examination and targeted testing are especially important in first-episode or atypical psychosis.
Alzheimer disease, Lewy body dementia, Parkinson disease dementia, vascular cognitive impairment, and frontotemporal degeneration can include delusions, hallucinations, misidentification, and accusations of theft or spying.
Clues: progressive memory, executive, visuospatial, language, or functional decline.
Delirium is an acute, fluctuating disturbance of attention and awareness caused by illness, medication, intoxication, withdrawal, pain, dehydration, or other physiological stress.
Medical emergency: new confusion, changing alertness, inattention, and fleeting misinterpretations require prompt evaluation.
In shared psychotic presentations, one person’s fixed beliefs may be adopted or reinforced by another person in an isolated, dependent, or highly enmeshed relationship. Digital spaces can create similar closed feedback loops when offline relationships and corrective information disappear.
A one-page timeline can be more useful than a large archive of interpreted “evidence.” Record dates, sleep, substances, medication changes, physical symptoms, mood, voices, major behavior changes, and functional impact.
Use the support-plan worksheetNational Institute of Mental Health
Mania, depression, psychosis, treatment, and research.
NHS
Overview of severe depression with delusions or hallucinations.
Merck Manual Consumer Version
Clinical overview of fixed delusions with otherwise relatively preserved functioning.
National Institute of Mental Health
PTSD symptoms, treatment, and research.
National Institute on Aging
Information about sudden confusion and medical causes in older adults.
Autoimmune Encephalitis Alliance
Information and support for autoimmune encephalitis, which can present with psychiatric symptoms.
Espionage Psychosis is an educational resource, not a diagnosis, emergency service, law-enforcement service, or substitute for a licensed clinician. Actual stalking, abuse, and privacy violations can occur; serious concerns deserve calm professional assessment without automatically confirming or dismissing them.