OCD statistics: Facts about obsessive-compulsive disorder

In this article:

• What is obsessive-compulsive disorder?
• How common is OCD?
• Co-occuring mental health conditions
• Causes of OCD
• Treating OCD
• FAQs

In this article

• What is obsessive-compulsive disorder?
• How common is OCD?
• Co-occuring mental health conditions
• Causes of OCD
• Treating OCD
• FAQs

OCD statistics at a glance
OCD statistic	Finding
Annual prevalence in U.S. adults	1.2%
Lifetime prevalence	3%
Average age of onset	Childhood or adolescence
Serious impairment	50%
Anxiety disorder comorbidity	82%
Depression comorbidity	68%

It’s not uncommon to have a specific morning routine or evening ritual that’s become an integral part of daily life. And it’s not abnormal to want a tidy home or clean workspace. However, if you feel anxious when something isn’t done just so or if you have to fight irrational or unwanted urges to repeat these tasks, there’s a possibility that these feelings are symptoms of obsessive-compulsive disorder (OCD). According to the 2025 International OCD Foundation (IOCDF) report, OCD affects an estimated 3% of people in their lifetime, but only 0.51% ever receive a formal diagnosis. This means that roughly 1 in 6 people with OCD are ever diagnosed.

​Below, we compiled the latest and most up-to-date statistics on OCD to illustrate its prevalence in the U.S.

What is obsessive-compulsive disorder?

OCD is a chronic psychiatric disorder characterized by a cycle of obsessive thoughts and compulsions. The National Institute of Mental Health (NIMH) defines obsessions as uncontrollable, recurring thoughts and compulsions as behaviors that a person feels the urge to repeat again and again.

OCD was previously categorized as a type of anxiety disorder. The current Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, has moved it within its own diagnostic class: Obsessive-Compulsive and Related Disorders (a class which also includes body dysmorphic disorder, hoarding disorder, and hair-pulling disorder).

​Some mental health professionals further classify OCD by theme:​

1. Contamination and germs: When obsession over germs and contamination leads to compulsive cleaning or handwashing
2. Harm: When aggressive obsessions or intrusive thoughts about causing violence to the self or others lead to avoidance of triggering people or places, or compulsive rituals (such as praying or seeking reassurance) to ensure that the thought is not acted upon
3. Symmetry or completion: When an obsession over symmetry and order leads to compulsive counting, reordering, and repetitive behaviors

Regardless of the specific behavior, the cycle of OCD persists through an internal reward and punishment system, where compulsive behaviors are repeated to reduce anxiety caused by obsessions.

Menije Boduryan-Turner, PsyD, a psychologist based in California, explains that OCD greatly affects a person’s life due to intrusive thoughts, anxiety, and uncertainty. OCD obsessions are intrusive and can be triggered at any time. Some people with OCD find it difficult to leave the house because ritualistic behavior in public can be embarrassing.

How common is OCD?

• OCD affects nearly 240 million people worldwide and up to 10 million people in the U.S. (IOCDF, 2025)
• About 3% of people in the U.S. will experience OCD at some point in their lives. (IOCDF, 2025)
• OCD is among the most common mental health disorders worldwide. (Comprehensive Psychiatry, 2022)

OCD statistics on severity:

Statistics on OCD severity are often based on the Yale-Brown Obsessive-Compulsive Scale, a widely used assessment involving a “clinician-rated semi-structured interview,” according to The Journal of Psychiatric Practice.

​Data from 10 countries published in BMC Medicine in 2025 show global statistics on OCD severity in people with a diagnosis:

• Nearly 75% of community OCD cases are mild or very mild.
• About 23% of community OCD cases are moderate.
• About 2.7% of OCD cases are severe.

It’s also important to remember that the IOCDF report showed roughly 1 in 6 people in the U.S. with OCD never receive a formal diagnosis. The report also found that:

• ​About 50% of people with OCD in the U.S. are unable to work or continue their education at some point due to OCD. (IOCDF, 2025)
• About 65% of adults and 90% of children and adolescents with OCD say their condition affects at least one aspect of their lives, such as relationships, cognition, or work. (IOCDF, 2025)
• Up to 96% of people with OCD have experienced moderate to severe symptoms at some point. (IOCDF, 2025)

OCD statistics by age:

Research does not always clearly differentiate between the age of OCD symptom onset and the age of OCD diagnosis. One possible reason for the lack of clarity is that people wait an average of 7–8 years to reach out to a healthcare provider after OCD symptoms begin, according to Cleveland Clinic.

• OCD can occur at any age. (IOCDF, 2025)
• About 50% of OCD cases begin by age 17.  (BMC Medicine, 2025)
• More than 80% of OCD cases begin by age 24. (BMC Medicine, 2025)

Child and teen OCD statistics

• OCD affects children, teens, and adults. (IOCDF, 2025)
• Roughly 1%–3% of children and teens have OCD. (American Academy of Pediatrics, 2025)
• An estimated 25% of OCD cases begin by age 14. (IOCDF, 2025)
• About half of OCD cases begin by age 17.  (BMC Medicine, 2025)

OCD statistics by gender

• OCD affects men and women at similar rates. (IOCDF, 2025)
• The lifetime prevalence of OCD is approximately 1.5% in women and 1% in men. (Journal of Clinical Psychiatry, 2020)
• OCD in men may be underreported because men are less likely than women to seek help for mental health. (IOCDF, 2025)

OCD statistics by race and ethnicity

According to the 2025 IOCDF report, OCD can occur in people of any race or ethnicity. It is equally prevalent across races and ethnicities. However, the IOCDF notes that white people are significantly overrepresented in OCD statistics because of underdiagnosis in non-white populations. Meaning, any OCD statistics by race or ethnicity offer a snapshot only of diagnosed individuals, not everyone experiencing OCD.

​The following are the percentages of diagnosed OCD cases based on the IOCDF’s data from 10.4 million individuals across all 50 states:

• ​OCD affects people of all races at similar rates.
• White individuals account for nearly 90% of documented OCD cases.
• Black individuals represent 6.2% of diagnosed OCD cases, the second-highest percentage after white individuals.

Postpartum OCD statistics

• OCD is more common in pregnant and postpartum women than in the general population. (Policy Center for Maternal Mental Health)
• About 3 to 5 % of new mothers in the U.S. experience postpartum/perinatal OCD (pOCD). (Anxiety and Depression Association of America, 2026)
• About 50% of women with pOCD have intrusive thoughts about intentionally harming their infant, but pOCD is not associated with actually causing harm. (Policy Center for Maternal Mental Health)
• Symptoms of pOCD, such as obsessive fear about infant harm and compulsive rituals (repeatedly checking on the baby, excessive washing), typically begin during pregnancy or just after delivery. (IOCD Foundation, 2023)

It’s important to seek treatment for symptoms of pOCD. The condition is well-documented and treatable. The IOCD Foundation notes that postpartum OCD and postpartum depression can be related, and sadness and anxiety can compound in a time when many women expect themselves to be happy. Tell your healthcare provider if you’re experiencing unwanted or anxious thoughts, compulsive behaviors, or unexplained sadness during or after pregnancy.

OCD statistics worldwide

Worldwide statistics on OCD are not widely reported, and several research reviews suggest that this disorder is underdiagnosed. Still, OCD statistics show similar diagnosis rates in Europe and North America:​

• OCD has a lifetime prevalence of 4.1%, based on data from 10 countries. (BMC Medicine, 2025)
• Across 10 countries surveyed, the 12-month prevalence of OCD is about 3%. (BMC Medicine, 2025)
• The 12-month prevalence of OCD in Europe ranges from 0.1% to 2.3%. (Comprehensive Psychiatry, 2022)

OCD and co-occurring mental health conditions

Approximately 2 in 3 adults with OCD have or have had at least one other mental health disorder. For example:

• About 50% of people with OCD also have major depressive disorder.
• About 25% of people with OCD also have other anxiety disorders.
• A little more than 10% of people with OCD also have personality disorders.

(Stanford Medicine)

Causes of OCD

The exact cause of OCD is unknown, but a combination of genetic, environmental, and neurobiological factors contributes to its development, according to the National Library of Medicine.

“Abnormalities in neurotransmitter systems (chemicals such as serotonin, dopamine, and glutamate that send messages between brain cells) are also involved in the disorder,” Dr. Boduryan-Turner says. Research suggests that low serotonin synthesis capacity may contribute to OCD, but more studies are needed to fully understand the neurotransmitter’s role in the disorder.

Treating OCD

The Anxiety and Depression Association of America reports that it takes 14–17 years, on average, to get a proper OCD diagnosis after symptom onset. This might be because it takes years for people to recognize their OCD symptoms and seek help. Getting a proper diagnosis is key because though OCD cannot be cured, it can be managed effectively with medication and psychotherapy treatment options.

Exposure and response prevention

Cognitive behavior therapy (CBT) is also commonly used to help people with OCD manage their anxiety and control their compulsions. Research shows that exposure and response prevention (ERP), a part of CBT, is a highly effective treatment for OCD. In ERP, patients are exposed to their triggers (such as dirt) in a slow, controlled manner. Dr. Boduryan-Turner explains that ERP teaches the brain how to respond differently to obsessions by tolerating the anxiety and discomfort that come with them.

In addition to medication and psychotherapy, the World Health Organization (WHO) recommends relaxation techniques (meditation and yoga, for instance) and support groups for people living with OCD. Even family members and loved ones of people with OCD can find support groups helpful.

SSRIs

Selective serotonin reuptake inhibitors (SSRIs), such as Prozac (fluoxetine), Zoloft (sertraline), or Lexapro (escitalopram), are commonly prescribed to people with OCD. It’s important to be patient and take these medications every day as prescribed, as it can take three to six months before maximum benefit is achieved, according to the University of Florida College of Medicine (UFCM). Fortunately, most people notice some benefits sooner, within eight to 12 weeks, per UFCM. Research shows that discontinuing an antidepressant presents a risk of OCD relapse.

The IOCDF reports OCD and suicide statistics, indicating an increased risk of suicide. Whether you are considering treatment, seeking treatment, or currently undergoing treatment, it’s important to tell someone if you are experiencing suicidal thoughts or urges. Call the 988 Suicide and Crisis Lifeline for free, confidential help.

OCD treatment statistics

• It takes, on average, 14–17 years to get an OCD diagnosis after symptoms begin. (Anxiety and Depression Association of America)
• About 50–60% of OCD patients who complete ERP treatment experience significant symptom improvement. (Psychology Research and Behavior Management, 2019)
• About 40-60% of OCD patients who take an SSRI experience improvements in symptoms and overall functioning. (IOCDF)
• A combination of ERP and SSRIs leads to more OCD symptom improvement than SSRIs alone. (Psychology Research and Behavior Management, 2019)

Frequently asked questions about OCD

How many people have OCD?

Approximately 1.2% of U.S. adults experience OCD each year, and roughly 3% of people will experience the condition during their lifetime.

Is OCD more common in women or men?

OCD diagnoses are more common in women, but a recent report from the International OCD Foundation emphasizes that the condition may develop equally in men and women. It could be that women are more likely to receive an OCD diagnosis because they are more likely to seek mental health support.

At what age does OCD usually start?

OCD tends to start in childhood or adolescence. More than 80% of cases start before age 24.

Can OCD go away on its own?

OCD doesn’t typically go away on its own. Although it’s a chronic condition, you can manage symptoms with psychotherapy, medication, or both.