Psychiatric Manifestations of Medical Illnesses

Psychiatric Manifestations of Medical Illnesses - MedIllness MindTwists

• Medical conditions frequently induce psychiatric symptoms, impacting diagnosis and management.
• Common Presentations:
  • Delirium: Acute confusional state, fluctuating course.
  • Depression: Persistent sadness, loss of interest.
  • Anxiety: Excessive worry, autonomic arousal.
  • Psychosis: Altered reality testing (hallucinations, delusions).
• Underlying Pathophysiology:
  • Inflammatory pathways (↑cytokines)
  • HPA axis dysregulation (cortisol effects)
  • Neurotransmitter imbalances (e.g., DA, 5-HT)
  • Direct brain insults (hypoxia, metabolic, structural)

⭐ Delirium is a common manifestation, especially in elderly or ICU patients; suspect it with any acute mental status change.

Psychiatric Manifestations of Medical Illnesses - Endocrine Echoes

• Thyroid Dysfunction:
  • Hyperthyroidism: Anxiety, agitation, emotional lability, psychosis, mania. (📌 Thyrotoxicosis: Too much T = Too much Talk/Tension)
  • Hypothyroidism: Depression ("myxedema madness"), cognitive slowing, psychomotor retardation, fatigue.
• Adrenal Gland Disorders:
  • Cushing's (↑Cortisol): Depression (most common), anxiety, irritability, psychosis, mania.
  • Addison's (↓Cortisol): Apathy, depression, fatigue, psychosis (rare).
• Parathyroid Gland Disorders:
  • Hyperparathyroidism (↑Ca): Depression, anxiety, fatigue, cognitive impairment, "psychic moans". (📌 Bones, stones, groans, moans)
  • Hypoparathyroidism (↓Ca): Anxiety, irritability, depression, psychosis, delirium, tetany.
• Pancreatic Islet Cell Dysfunction (Diabetes):
  • Hypoglycemia: Acute anxiety, irritability, confusion, delirium, seizures.
  • Chronic Diabetes: Increased risk of depression & anxiety disorders.

⭐ In Cushing's syndrome, psychiatric symptoms like depression or mania can be the initial presentation, preceding characteristic physical stigmata.

Psychiatric Manifestations of Medical Illnesses - Neuro Nudges

• Stroke: Post-stroke depression (PSD) common, esp. L-frontal. Anxiety, apathy.
• Epilepsy: Depression, anxiety, psychosis (inter/postictal). TLE → Geschwind syndrome (📌 Hypergraphia, Religiosity, Hyposexuality, Stickiness).
• Parkinson's (PD): Depression (often pre-motor), anxiety, psychosis (med-induced), apathy.

  ⭐ Depression is the most common psychiatric comorbidity in Parkinson's disease, often preceding motor symptoms.

• Huntington's (HD): Depression, irritability, psychosis. Psych sx often pre-motor.
• Multiple Sclerosis (MS): Depression (most common), anxiety, euphoria (rare), cognitive issues.
• Brain Tumors: Location-dependent. Frontal → personality change, apathy. Temporal → psychosis.
• TBI: Depression, anxiety, PTSD, irritability, personality change.

Psychiatric Manifestations of Medical Illnesses - Immune Intrusions

• Infectious Agents:
  • HIV: Depression, anxiety, psychosis, HAND. Consider opportunistic infections.
  • Neurosyphilis: GPI (dementia, psychosis, personality change), Argyll Robertson pupil.
  • Lyme Disease: Depression, anxiety, cognitive fog. Psychosis rare.
  • Viral Encephalitis (HSV): Acute psychosis, amnesia, Klüver-Bucy (temporal lobe).
• Autoimmune Disorders:
  • SLE: Depression, psychosis (lupus cerebritis), cognitive issues. Neuropsychiatric SLE.
  • Anti-NMDA Receptor Encephalitis:

⭐ Anti-NMDA receptor encephalitis: prominent psychiatric onset (psychosis, agitation) before neurological signs, esp. young women.

Psychiatric Manifestations of Medical Illnesses - Systemic Signals

• Cardiac/Pulmonary Failure: Anxiety, depression, delirium. Hypoxia/hypercapnia worsen.
• Renal Failure (Uremia): Depression, anxiety, psychosis, delirium (uremic).
• Hepatic Encephalopathy: Personality change, ↓cognition, asterixis, delirium.
• Nutritional Deficiencies:
  • B12: Depression, psychosis ("megaloblastic madness"), dementia.
  • Thiamine (B1): Wernicke (confusion, ataxia, ophthalmoplegia) → Korsakoff (amnesia, confabulation).
  • Niacin (B3) (Pellagra): 📌 3 D's: Dermatitis, Diarrhea, Dementia; depression, psychosis.
  • Folate (B9): Depression, cognitive impairment.

⭐ Wernicke's encephalopathy requires emergent IV thiamine before glucose to prevent precipitation or worsening.

High‑Yield Points - ⚡ Biggest Takeaways

• Delirium is common in medically ill; suspect infections, metabolic issues, drugs, especially in elderly.
• Hypothyroidism frequently presents with depression, fatigue, and cognitive slowing.
• Hyperthyroidism can mimic anxiety disorders or mania; consider apathetic hyperthyroidism in elderly.
• Cushing's syndrome is strongly linked to depression, anxiety, and steroid-induced psychosis.
• Vitamin B12 deficiency may cause dementia, mood changes, or psychosis; screen if unexplained.
• Neuropsychiatric SLE has diverse manifestations including psychosis, mood disorders, and cognitive impairment.