This document provides information about obsessive compulsive disorder (OCD) and cognitive behavioral therapy (CBT). It defines OCD as having obsessions (unreasonable thoughts and fears) and compulsions (repetitive behaviors). The document describes common symptoms like repetitive checking, cleaning, or rituals. It notes OCD often begins in childhood/teen years and runs in families. CBT is discussed as an effective treatment that works by changing unhelpful thoughts and behaviors. Exposure and response prevention therapy is highlighted as a key CBT technique for OCD where patients face fears and stop compulsions. The document concludes by reminding students about an upcoming unit project on anxiety disorders.