bsessive-compulsive disorder (OCD) is a chronic mental health condition (affecting ~1-2% of people) characterized by uncontrollable, recurring thoughts (obsessions) and repetitive behaviors (compulsions) that consume significant time, often >1 hour/day. Common symptoms include intense cleaning, ordering, checking, or mental rituals to manage distress. Causes likely involve genetic, biological, and environmental factors. Key Aspects of OCD Symptoms: Obsessions include fear of contamination, forbidden thoughts, or need for symmetry. Compulsions are behaviors meant to relieve anxiety, such as washing, cleaning, checking, and mental acts. Types: While not rigid categories, OCD often manifests as themes like contamination/cleaning, checking/responsibility, symmetry/ordering, or intrusive thoughts/mental rituals. Causes & Risk Factors: While the exact cause is unknown, it is thought to involve brain structure abnormalities, neurotransmitter issues (serotonin), genetics, and childhood trauma. Prevalence: OCD affects approximately 1% to 2% of the general population. Treatment: Effective treatments include Cognitive Behavioral Therapy (CBT), specifically Exposure and Response Prevention (ERP), and medication, such as Selective Serotonin Reuptake Inhibitors (SRIs). Symptoms often start in childhood or young adulthood, with severity ranging from mild to debilitating.