🧠 Neuropsychiatric & Psychiatric Disorders
Professional overview at the neurology–psychiatry interface — compact, sortable tables with mobile cards, clinical pearls, and quick links.
1) Neuropsychiatric Disorders
Definition: Conditions with behavioral, cognitive, and emotional disturbance arising from organic or functional changes in the brain (lesions, neurodegeneration, immune-mediated inflammation, metabolic dysfunction, or structural anomalies). Often multidisciplinary.
Key feature: Rooted in measurable or inferred neuropathology (e.g., limbic dysfunction, basal ganglia involvement, neurotransmitter dysregulation).
| Category ⇅ | Examples ⇅ | Clinical Features ⇅ |
|---|---|---|
| Autoimmune Encephalopathy | Anti-NMDA receptor encephalitis; Hashimoto’s encephalopathy; PANDAS/PANS | Acute/subacute psychosis, catatonia, seizures, memory deficits, movement disorders, sleep disruption |
| Basal Ganglia Disorders | Huntington’s disease; Wilson’s disease; Sydenham chorea | Mood instability, OCD, tics, irritability, aggression, chorea, executive dysfunction |
| Traumatic Brain Injury (TBI) | Post-concussion syndrome; chronic traumatic encephalopathy (CTE) | Depression, impulsivity, personality change, irritability, cognitive slowing, apathy |
| Neurodegenerative Disorders | Frontotemporal dementia; Alzheimer’s disease; Parkinson’s disease with dementia | Early disinhibition, apathy, paranoia, hallucinations, delusions, agitation |
| Neurodevelopmental Conditions | Autism spectrum disorder; ADHD; Tourette syndrome | Impulsivity, anxiety, emotional dysregulation, sensory processing abnormalities, stereotypies |
| Seizure-Related Psychosis | Postictal psychosis; temporal-lobe epilepsy affective change | Paranoia, auditory hallucinations, affective lability, dissociation |
| Infectious / Metabolic | HIV-associated neurocognitive disorder; hepatic encephalopathy; B12 deficiency | Apathy, irritability, confusion, hallucinations, mood swings |
| Genetic Neurobehavioral Syndromes | 22q11.2 deletion; Fragile X; Prader-Willi | Psychiatric comorbidity (psychosis, OCD, ADHD, ASD), cognitive delay, dysregulation |
Autoimmune Encephalopathy
Examples: Anti-NMDA receptor encephalitis; Hashimoto’s; PANDAS/PANS
Clinical: Psychosis/catatonia, seizures, memory loss, movement disorder, sleep disruption
Basal Ganglia Disorders
Examples: Huntington’s; Wilson’s; Sydenham chorea
Clinical: Mood/OCD/tics, irritability, chorea, executive dysfunction
Traumatic Brain Injury (TBI)
Examples: Post-concussion; CTE
Clinical: Depression, impulsivity, personality change, cognitive slowing
Neurodegenerative Disorders
Examples: FTD; Alzheimer’s; Parkinson’s w/ dementia
Clinical: Disinhibition, apathy, paranoia, hallucinations, delusions
Neurodevelopmental Conditions
Examples: ASD; ADHD; Tourette
Clinical: Impulsivity, sensory issues, anxiety, stereotypies
Seizure-Related Psychosis
Examples: Postictal psychosis; TLE affective
Clinical: Paranoia, AH, affective lability, dissociation
Infectious / Metabolic
Examples: HAND; hepatic encephalopathy; B12 deficiency
Clinical: Apathy, irritability, confusion, hallucinations
Genetic Neurobehavioral Syndromes
Examples: 22q11.2; Fragile X; Prader-Willi
Clinical: Psychosis/OCD/ADHD/ASD, cognitive delay
2) Psychiatric Disorders
Definition: Mental health conditions primarily classified by behavioral symptoms, mood alteration, and thought disturbance. Diagnosed clinically (DSM-5-TR) though neurobiological correlates are common.
| Category ⇅ | Examples ⇅ | Core Features ⇅ |
|---|---|---|
| Mood Disorders | Major depressive disorder; Bipolar I/II | Depressed or elevated mood, anhedonia, suicidality, sleep/appetite change |
| Anxiety Disorders | GAD; Panic disorder; Social anxiety | Excessive worry, autonomic arousal, restlessness, avoidance |
| Obsessive-Compulsive Spectrum | OCD; Body dysmorphic; Hoarding | Obsessions/compulsions; repetitive thoughts/behaviors |
| Trauma-Related | PTSD; Complex PTSD; Acute stress | Intrusions, hyperarousal, avoidance, dissociation |
| Psychotic Disorders | Schizophrenia; Schizoaffective; Brief psychosis | Delusions, hallucinations, disorganized thought/behavior, negative symptoms |
| Personality Disorders | Borderline; Antisocial; Narcissistic | Enduring, maladaptive patterns in cognition/affect/interpersonal function |
| Somatic Symptom Disorders | Somatic symptom; Illness anxiety; Conversion | Excessive symptom focus; maladaptive health behaviors |
| Feeding & Eating | Anorexia; Bulimia; ARFID | Body image disturbance; restrictive/compensatory behaviors |
| Disruptive/Impulse | IED; Oppositional defiant; Conduct | Aggression, rule violation, dysregulation, impulsivity |
| Substance-Induced | Alcohol-induced psychosis; Stimulant use | Dependence, withdrawal, cognitive/behavioral effects from substances |
Mood Disorders
Examples: MDD; Bipolar I/II
Features: Mood change, anhedonia, suicidality, sleep/appetite
Anxiety Disorders
Examples: GAD; Panic; Social anxiety
Features: Worry, autonomic arousal, avoidance
Obsessive-Compulsive Spectrum
Examples: OCD; BDD; Hoarding
Features: Obsessions/compulsions; repetitive behaviors
Trauma-Related
Examples: PTSD; cPTSD; Acute stress
Features: Intrusions, hyperarousal, avoidance
Psychotic Disorders
Examples: Schizophrenia; Schizoaffective; Brief psychosis
Features: Delusions, hallucinations, disorganization
Personality Disorders
Examples: Borderline; Antisocial; Narcissistic
Features: Enduring maladaptive patterns
Somatic Symptom Disorders
Examples: Somatic symptom; Illness anxiety; Conversion
Features: Excessive symptom focus
Feeding & Eating
Examples: Anorexia; Bulimia; ARFID
Features: Body image disturbance; restrictive behaviors
Disruptive/Impulse
Examples: IED; ODD; Conduct
Features: Aggression, rule violation
Substance-Induced
Examples: Alcohol-psychosis; Stimulant use
Features: Dependence, withdrawal
3) Neuropsychiatric vs Psychiatric — Key Differentiators
| Dimension ⇅ | Neuropsychiatric ⇅ | Psychiatric ⇅ |
|---|---|---|
| Etiology | Neurologic, autoimmune, genetic, metabolic, infectious | Multifactorial: genetic, environmental, psychosocial |
| Diagnosis | Labs, imaging, EEG, CSF, genetics often abnormal | Primarily clinical via DSM-5-TR |
| Treatment | Immunotherapy, anticonvulsants, disease-modifying agents | Psychotherapy; psychotropics (SSRIs, SNRIs, antipsychotics) |
| Response to Rx | Can worsen with psychotropics if organic cause missed | Often improves with standard psychiatric care |
| Examples | Anti-NMDAR encephalitis, PANDAS, Huntington’s, epilepsy | MDD, GAD, OCD, BPD, PTSD |
4) Clinical Pearls for Differential Diagnosis
- Abrupt onset of psychiatric symptoms → Evaluate for autoimmune encephalitis, metabolic derangement, CNS infection.
- Treatment resistance → Reconsider neuroinflammatory, epileptic, or neurodegenerative causes.
- Seizures, dyskinesia, autonomic instability → Urgent neurologic workup.
- Early-onset psychosis + family neurologic history → Consider genetic syndromes.
- Strep history with OCD/tics (youth) → Rule out PANDAS.