Principles and Concepts of Mental Health Nursing Comprehensive Mental Health Nursing Terminology (With Detailed Explanations & Examples for Mental Disorders, Symptoms, Diagnosis, Treatments, and Therapies) 1. Mental Disorders & Related Terminology Understanding mental disorders is essential for nurses working in psychiatric settings. Below are key disorders with definitions, features, and examples. Psychotic Disorders Mood Disorders Anxiety Disorders Obsessive-Compulsive and Related Disorders Trauma-Related Disorders Dissociative Disorders Somatic Symptom & Related Disorders