Dr. Kimberly Nordstrom, Past President of the American Association for Emergency Psychiatry and Associate Clinical Professor of Psychiatry at the University of Colorado, discusses the process of considering medical contributions to psychiatric illness. We discuss red flags that should guide clinicians to start thinking medically, explain the importance of systematically approaching a differential diagnosis, and provide a brief introduction to a few common medical-psychiatric conditions including autoimmune encephalitis, neuroleptic malignant syndrome (NMS), and serotonin toxicity ("serotonin syndrome"). Book: Quick Guide to Psychiatric Emergencies: Tools for Behavioral and Toxicological Situations (Check your academic library!!!)