Health Conditions A-Z Mental Illness OCD What Is Obsessive-Compulsive Disorder (OCD)? By Lindsay Curtis Lindsay Curtis Lindsay Curtis is a health writer with over 20 years of experience in writing health, science & wellness-focused articles. health's editorial guidelines Published on April 5, 2023 Medically reviewed by Dakari Quimby, PhD Medically reviewed by Dakari Quimby, PhD Dakari Quimby, PhD, is a Clinical Assistant Professor of Psychiatry & Behavioral Sciences at the University of Southern California. learn more Share this page on Facebook Share this page on Twitter Share this page on Pinterest Email this page In This Article View All In This Article Types Symptoms Causes Diagnosis Treatment Prevention Comorbid Conditions Living With OCD Obsessive-compulsive disorder (OCD) is a mental health condition that causes unwanted and intrusive thoughts or images (obsessions) and repetitive behaviors and actions (compulsions). Obsessions cause significant anxiety and distress, driving people with OCD to perform repetitive, ritualistic actions for temporary relief. Many people have the occasional obsession or compulsive behavior, but with OCD, the thoughts and behaviors are time-consuming and interfere with daily functioning. An estimated 2-3% of people in the U.S. live with OCD, which often begins in childhood, adolescence, or early adulthood. The exact cause of OCD is unknown, but research suggests a combination of genetic, neurological, and environmental factors play a role. Treatment options for OCD usually involve psychotherapy and medication to help manage symptoms and improve your quality of life. Facts About OCD That May Surprise You Types of OCD There are many subtypes of OCD—and symptoms can present in different ways. However, OCD mainly falls into four categories: contamination, checking, symmetry/order, and intrusive/taboo thoughts. If you have OCD, it's common to have symptoms that fall under more than one of these subtypes. Contamination OCD With contamination OCD, you may have an overwhelming fear of germs or getting sick from objects or people. This may lead to excessive hand washing or avoiding touching things you think may be contaminated. It's possible to also excessively worry about ingredients in household cleaning products or frequently change clothes throughout the day. However, fear of emotional contamination can also occur and cause you to avoid certain people, places, or situations you view as scary or dirty. Checking OCD Compulsive checking stems from a fear of harm or danger to yourself or other people. With this subtype of OCD, you may find yourself repeatedly checking to ensure the door is locked, appliances are turned off, and car brakes are working. Sometimes you may need constant reassurance from others that you have not done harm to others or made a mistake. Things That Can Cause Anxiety Symmetry and Order OCD Symmetry and order obsessions derive from the need for perfectly aligned, organized, or symmetrical things. In such cases, you may strive for perfectionism and orderliness and spend a lot of time rearranging and aligning objects at home or work until they are "just right." It may be common to also perform tasks in a specific order or tap things a certain number of times. With this type of OCD, you might have extreme anxiety or have superstitious beliefs that something terrible will happen if items are not perfectly balanced. Intrusive/Taboo Thoughts OCD OCD-related intrusive and taboo thoughts are often centered around themes of violence, sex, or religion. For example, you might have graphic mental images of violence or sexual acts that are disturbing. You might notice that you're ruminating over your religious identity or sexual orientation. Intrusive and taboo thoughts may cause guilt, shame, and anxiety and drive your to perform compulsive rituals to help calm down your feelings, such as constant praying, tapping, or saying specific phrases to "cancel out" negative thoughts. Symptoms OCD symptoms fall into two groups: obsessions and compulsions. While some people may only have obsessions or compulsions, most people with OCD experience both. Along with obsessions and compulsions, people with OCD may avoid places, people, or situations that trigger their obsessions or compulsions. Obsessions Obsessions are persistent and often irrational thoughts, urges, or mental images that cause significant distress and anxiety. Examples of obsessions include: Fear of contamination or germsWorry of harm or danger to yourself or others Need for constant reassuranceUnwanted and unpleasant thoughts or images about sex, religion, or violence Compulsions Compulsions are repetitive behaviors or mental acts people with OCD perform to reduce anxiety, distress, or preventing a dreaded event or situation caused by their obsessions. Compulsions are not always clearly excessive or connected to what they are trying to prevent or neutralize. Examples of compulsions include: Excessive cleaning or washingRepeatedly checking locks, appliances, and other objects to ensure they are safe or turned off Constantly arranging and organizing objects in a specific way or according to a strict pattern Repeating phrases, counting, tapping, touching, or silently praying Causes The exact cause of OCD is not fully understood, but research suggests a combination of several factors likely play a role. These factors may include: Genetics: OCD often runs in families, and having a parent, sibling, or child with OCD raises your risk of experiencing symptoms. Research suggests genes play a more significant role when OCD symptoms begin in childhood. Brain structure: Researchers have discovered that people with OCD have differences in their brain structure and function, particularly in the areas of the brain that regulate emotions, impulse control, and decision-making. Life events: Stressful events and traumatic experiences—such as a car accident or experiencing abuse—may trigger OCD symptoms in some people. Research shows this may be more common in women. Comorbid (or, co-occurring) conditions: People with pre-existing anxiety or mood disorders, and those with a history of certain infections (e.g., streptococcal infection), are at an increased risk of OCD. Diagnosis The first step in getting an OCD diagnosis is visiting a healthcare provider who has the knowledge and skills to make an OCD diagnosis, such as a psychiatrist, psychologist, or licensed mental health professional. No single test or procedure can definitively diagnose OCD, so healthcare providers usually use their professional judgment after learning about your symptoms and medical history. Some healthcare providers may perform a physical examination and order blood tests or other lab tests to rule out other conditions that may cause symptoms similar to OCD. Healthcare providers use the OCD diagnostic criteria listed in the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) to make a diagnosis. Diagnostic criteria for OCD include: The presence of obsessions, compulsions, or both Obsessions and compulsions that last for more than one hour per day and cause significant distress and/or interfere with daily activities Symptoms that are not due to substance use, prescription medications, or an underlying health condition To learn about your symptoms, how often they occur, how intense they can be, and what triggers them, your provider will likely conduct a structured clinical interview. They may use a standardized rating scale, such as the Yale-Brown Obsessive Compulsive Scale (Y-BOCS), to measure the severity of your OCD symptoms and how they interfere with your day-to-day life. Your provider will also ask about your medical and psychiatric history, family history, and substance use (e.g., drugs and alcohol). Relationship OCD (ROCD) Is a Real Diagnosis—Here's What to Do If You Have It Treatment The goal of OCD treatment is to help you learn new, healthy ways to respond to your thoughts to eliminate and reduce your symptoms and their effect on your life. While there is no cure for OCD, there are effective treatments—and research shows that over 50% of people with OCD who follow their treatment plan achieve remission (or, a period where you experience little to no symptoms). Treatment for OCD usually involves a combination of psychotherapy and medication. Psychotherapy Psychotherapy, particularly cognitive-behavioral therapy (CBT), is a first-line treatment for OCD. Exposure and response prevention (ERP) is a specific type of CBT that involves gradual exposure to your fears or obsessions and learning how to replace compulsive behaviors with healthy coping strategies that can help you reduce anxiety. Medications Your provider may choose to prescribe you medication, which can either be used alone or in combination with psychotherapy. People with OCD who take prescription medications experience a 40-60% reduction in symptoms. Selective serotonin reuptake inhibitors (SSRIs) are the most effective medication for OCD. SSRIs are antidepressants, but they also help reduce OCD symptoms by boosting serotonin (a hormone that helps your brain regulate mood, sleep, and other body functions) levels in the brain. How to Prevent OCD There is no known way to prevent OCD from developing, but early diagnosis and treatment can help improve symptoms and prevent them from worsening over time. OCD is a complex condition, and following your treatment plan and seeking continued support from mental health professionals can help reduce the frequency of triggers and symptoms and improve your chances of achieving remission. Stressful life events and situations can trigger OCD symptoms, so finding healthy ways to manage stress—whether through exercise, meditation, or OCD support groups—may also be helpful. Some people find that mindfulness techniques can help you see your obsessive thoughts more objectively and help you let go of harmful thinking. Comorbid Conditions About 90% of people with OCD also have at least one other mental health condition. When a person has one or more mental health diagnoses simultaneously, they are known as comorbid conditions or comorbidities. Common OCD comorbidities include: Anxiety disorders: Ongoing and excessive worry and fears about various things (e.g., social anxiety or generalized anxiety disorder). Major depressive disorder: Persistent sadness, hopelessness, and loss of interest in activities. Eating disorders: Unhealthy patterns of eating and a preoccupation with body image (e.g., anorexia nervosa or bulimia). Bipolar disorders: Extreme changes in mood, behavior, and energy levels. Substance use disorder: Excessive use of substances (e.g., drugs or alcohol). Living With OCD Living with OCD can be challenging—between the overwhelming, obsessive thoughts and time-consuming compulsions, the disorder's effect on your life can be devastating. Fortunately, with effective treatments and healthy coping strategies, many people with OCD live fulfilling and productive lives. If you're newly diagnosed with OCD or know someone with the condition, learning as much as possible about the condition can help you understand why obsessions and compulsions occur and extend grace and patience during times of struggle. Many people with OCD find community and camaraderie by joining OCD support groups. Connecting with others who understand what you're going through can be helpful, and many groups offer practical advice and coping strategies. Was this page helpful? Thanks for your feedback! Tell us why! 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