Obsessive-compulsive disorder (OCD) is a common, chronic, and long-lasting disorder in which a person has uncontrollable, reoccurring thoughts ("obsessions") and/or behaviors ("compulsions") that he or she feels the urge to repeat over and over.
Signs and Symptoms
People with OCD may have symptoms of obsessions, compulsions, or both. These symptoms can interfere with all aspects of life, such as work, school, and personal relationships.
Obsessions are repeated thoughts, urges, or mental images that cause anxiety. Common symptoms include:
- Fear of germs or contamination
- Unwanted forbidden or taboo thoughts involving sex, religion, or harm
- Aggressive thoughts towards others or self
- Having things symmetrical or in a perfect order
Compulsions are repetitive behaviors that a person with OCD feels the urge to do in response to an obsessive thought. Common compulsions include:
- Excessive cleaning and/or handwashing
- Ordering and arranging things in a particular, precise way
- Repeatedly checking on things, such as repeatedly checking to see if the door is locked or that the oven is off
- Compulsive counting
Not all rituals or habits are compulsions. Everyone double checks things sometimes. But a person with OCD generally:
- Can't control his or her thoughts or behaviors, even when those thoughts or behaviors are recognized as excessive
- Spends at least 1 hour a day on these thoughts or behaviors
- Doesn’t get pleasure when performing the behaviors or rituals, but may feel brief relief from the anxiety the thoughts cause
- Experiences significant problems in their daily life due to these thoughts or behaviors
Some individuals with OCD also have a tic disorder. Motor tics are sudden, brief, repetitive movements, such as eye blinking and other eye movements, facial grimacing, shoulder shrugging, and head or shoulder jerking. Common vocal tics include repetitive throat-clearing, sniffing, or grunting sounds.
Symptoms may come and go, ease over time, or worsen. People with OCD may try to help themselves by avoiding situations that trigger their obsessions, or they may use alcohol or drugs to calm themselves. Although most adults with OCD recognize that what they are doing doesn’t make sense, some adults and most children may not realize that their behavior is out of the ordinary. Parents or teachers typically recognize OCD symptoms in children.
If you think you have OCD, talk to your health care provider about your symptoms. If left untreated, OCD can interfere in all aspects of life.
OCD is a common disorder that affects adults, adolescents, and children all over the world. Most people are diagnosed by about age 19, typically with an earlier age of onset in boys than in girls, but onset after age 35 does happen. For statistics on OCD in adults, please see the NIMH Obsessive-Compulsive Disorder webpage.
The causes of OCD are unknown, but risk factors include:
Twin and family studies have shown that people with first-degree relatives (such as a parent, sibling, or child) who have OCD are at a higher risk for developing OCD themselves. The risk is higher if the first-degree relative developed OCD as a child or teen. Ongoing research continues to explore the connection between genetics and OCD and may help improve OCD diagnosis and treatment.
Brain Structure and Functioning
Imaging studies have shown differences in the frontal cortex and subcortical structures of the brain in patients with OCD. There appears to be a connection between the OCD symptoms and abnormalities in certain areas of the brain, but that connection is not clear. Research is still underway. Understanding the causes will help determine specific, personalized treatments to treat OCD.
An association between childhood trauma and obsessive-compulsive symptoms has been reported in some studies. More research is needed to understand this relationship better.
In some cases, children may develop OCD or OCD symptoms following a streptococcal infection—this is called Pediatric Autoimmune Neuropsychiatric Disorders Associated with Streptococcal Infections (PANDAS). For more information, please read NIMH's fact sheet on PANDAS.
Treatments and Therapies
OCD is typically treated with medication, psychotherapy, or a combination of the two. Although most patients with OCD respond to treatment, some patients continue to experience symptoms.
Sometimes people with OCD also have other mental disorders, such as anxiety, depression, and body dysmorphic disorder, a disorder in which someone mistakenly believes that a part of their body is abnormal. It is important to consider these other disorders when making decisions about treatment.
Serotonin reuptake inhibitors (SRIs), which include selective serotonin reuptake inhibitors (SSRIs) are used to help reduce OCD symptoms.
SRIs often require higher daily doses in the treatment of OCD than of depression and may take 8 to 12 weeks to start working, but some patients experience more rapid improvement.
If symptoms do not improve with these types of medications, research shows that some patients may respond well to an antipsychotic medication. Although research shows that an antipsychotic medication may help manage symptoms for people who have both OCD and a tic disorder, research on the effectiveness of antipsychotics to treat OCD is mixed.
If you are prescribed a medication, be sure you:
- Talk with your health care provider or a pharmacist to make sure you understand the risks and benefits of the medications you're taking.
- Do not stop taking a medication without talking to your health care provider first. Suddenly stopping a medication may lead to "rebound" or worsening of OCD symptoms. Other uncomfortable or potentially dangerous withdrawal effects are also possible.
- Report any concerns about side effects to your health care provider right away. You may need a change in the dose or a different medication.
- Report serious side effects to the U.S. Food and Drug Administration (FDA) MedWatch Adverse Event Reporting program online or by phone at 1-800-332-1088. You or your health care provider may send a report.
Other medications have been used to treat OCD, but more research is needed to show the benefit of these options. For basic information about these medications, you can visit the NIMH Mental Health Medications webpage. For the most up-to-date information on medications, side effects, and warnings, visit the FDA website.
Psychotherapy can be an effective treatment for adults and children with OCD. Research shows that certain types of psychotherapy, including cognitive behavior therapy (CBT) and other related therapies (e.g., habit reversal training) can be as effective as medication for many individuals. Research also shows that a type of CBT called Exposure and Response Prevention (EX/RP)—spending time in the very situation that triggers compulsions (e.g. touching dirty objects) but then being prevented from undertaking the usual resulting compulsion (e.g. handwashing)—is effective in reducing compulsive behaviors in OCD, even in people who did not respond well to SRI medication.
As with most mental disorders, treatment is usually personalized and might begin with either medication or psychotherapy, or with a combination of both. For many patients, EX/RP is the add-on treatment of choice when SRIs or SSRIs medication does not effectively treat OCD symptoms or vice versa for individuals who begin treatment with psychotherapy.
Other Treatment Options
In 2018, the FDA approved Transcranial Magnetic Stimulation (TMS) as an adjunct in the treatment of OCD in adults.
NIMH is supporting research into other new treatment approaches for people whose OCD does not respond well to the usual therapies. These new approaches include combination and add-on (augmentation) treatments, as well as novel techniques such as deep brain stimulation. You can learn more about brain stimulation therapies on the NIMH website.
For general information on mental health and to locate treatment services in your area, call the Substance Abuse and Mental Health Services Administration (SAMHSA) Treatment Referral Helpline at 1-800-662-HELP (4357). SAMHSA also has a Behavioral Health Treatment Locator on its website that can be searched by location. You can also visit the NIMH’s Help for Mental Illnesses page for more information and resources.
Join a Study
Clinical trials are research studies that look at new ways to prevent, detect, or treat diseases and conditions. The goal of clinical trials is to determine if a new test or treatment works and is safe. Although individuals may benefit from being part of a clinical trial, participants should be aware that the primary purpose of a clinical trial is to gain new scientific knowledge so that others may be better helped in the future.
Researchers at NIMH and around the country conduct many studies with patients and healthy volunteers. We have new and better treatment options today because of what clinical trials uncovered years ago. Be part of tomorrow’s medical breakthroughs. Talk to your health care provider about clinical trials, their benefits and risks, and whether one is right for you.
To learn more or find a study, visit:
- NIMH’s Clinical Trials webpage: Information about participating in clinical trials
- Clinicaltrials.gov: Current Studies on OCD: List of clinical trials funded by the National Institutes of Health (NIH) being conducted across the country
Free Booklets and Brochures
- Obsessive-Compulsive Disorder: When Unwanted Thoughts Take Over: This brochure provides information on OCD including signs and symptoms, causes, and treatment options such as psychotherapy and medication. Also available en español.
- Obsessive-Compulsive Disorder (MedlinePlus – also en español)
Research and Statistics
- Journal Articles: This webpage provides information on references and abstracts from MEDLINE/PubMed (National Library of Medicine).
- OCD Statistics: Adults: This webpage lists information on the prevalence of OCD among adults.
Last Reviewed: September 2022
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