This document provides an overview of psychological disorders and their treatment. It discusses what constitutes abnormal behavior and outlines several approaches to understanding the etiology of psychological disorders, including the biological, psychological, and sociocultural approaches. It then describes several major categories of psychological disorders like mood disorders, anxiety disorders, dissociative disorders, eating disorders, and schizophrenia. For each disorder, it provides details on symptoms, causes, and common treatments. It also discusses different classification systems for psychological disorders and criticisms of these systems.