This clinical text examines the pathophysiology, diagnosis, and treatment of disorders stemming from trauma and severe stress across the lifespan. It explores how adverse childhood experiences alter brain development and neurobiology, leading to conditions such as reactive attachment disorder and posttraumatic stress disorder. The authors detail the nuances of dissociative disorders, explaining how the mind involuntarily disconnects from reality as a protective defense mechanism. Nursing interventions are prioritized, emphasizing a trauma-informed care approach that focuses on establishing patient safety and emotional stabilization. Finally, the source highlights evidence-based recovery modalities, including pharmacotherapy, cognitive behavioral therapy, and eye movement desensitization and reprocessing.