Obsessive Compulsive Disorder and PTSD: Considerations for Screening and Treatment

U.S. Air Force photo by Senior Airman Christian Clausen
By Nancy Skopp, Ph.D.
November 16, 2020

Obsessive compulsive disorder (OCD) and posttraumatic stress disorder (PTSD) rank among the most debilitating, distressing, difficult and expensive-to-treat mental health conditions. While the two conditions were once considered to be unrelated, accumulating evidence indicates they often co-occur.

OCD and PTSD commonly occur in people with trauma history. Although the association between the co-occurrence of the two disorders is unclear, some researchers have speculated that obsessive-compulsive behavior may be used to cope with, reduce, and avoid trauma-related stimuli.


Screening and treatment for PTSD are routine in DoD and VA health care systems, however, OCD often goes unrecognized and untreated, or is inadequately treated. A recent study showed that less than half of VA providers could identify exposure and response prevention (ERP) as the frontline treatment for OCD, and less than 25 percent had training in OCD treatment.

OCD and PTSD share some symptoms:

  • Feelings of disgust or guilt
  • Recurrent, intrusive memories or thoughts that induce distress
  • Behaviors and actions that reduce or neutralize distress (e.g., rituals, isolation, avoidance)

Disentangling the symptoms of OCD and PTSD can be tricky. A clinician may recognize and treat PTSD symptoms but may not identify and address co-occurring OCD. It can further complicate OCD diagnosis that some patients do not exhibit behavioral compulsions such as checking but instead engage in less observable mental rituals. Use of OCD screening and assessment tools among PTSD patients, coupled with availability of training for evidence-based OCD treatment, is essential.


When addressing PTSD it is important for providers to be aware of a potential co-occurrence of OCD and how it may influence treatment. If only one disorder is identified and treated, the failure to consider the other may greatly intensify patient distress. And when both disorders are co-occurring, treatments targeted separately for each can sometimes be counterproductive. ERP treatment is the psychotherapeutic treatment of choice for OCD, while cognitive behavioral therapies (CBTs) such as prolonged exposure and cognitive processing therapy are recommended by VA/DoD clinical practice guidelines for PTSD. However, ERP treatment for OCD has been shown in some cases to be adversely influenced by co-occurring PTSD. Clinicians should assess for both PTSD and OCD in trauma patients to better direct the appropriate combinations of treatments and ensure the overall quality of care. Neglecting to do so can significantly reduce treatment efficacy and contribute to patient distress. 

Additional resources

The International OCD Foundation is a donor-supported nonprofit organization that provides resources and training for clinicians as well as links to resources for OCD sufferers and their families, including support groups and teletherapy.

Although there is no VA/DoD clinical practice guideline for the treatment of OCD or co-occurring OCD and PTSD, the VA/DoD guideline for PTSD and other relevant links for PTSD treatment can be found on the PHCoE website.

The VA’s South Central Mental Illness Research Education and Clinical Center provides a fact sheet on Examining the Differential Diagnosis Between OCD and PTSD.    

Dr. Skopp is a research psychologist at the Psychological Health Center of Excellence West at Joint Base Lewis McChord in Tacoma, WA and an affiliate associate professor at the University of Washington Department of Psychiatry and Behavioral Sciences. Her expertise is in military psychological health research.

The views expressed in Clinician's Corner blogs are solely those of the author and do not necessarily reflect the opinion of the Psychological Health Center of Excellence or Department of Defense.


  • In 5 decades of clinical experience, I don't recall seeing this particular clinical presentation. In combat vets dating back to WW TWO and including the post 911 conflicts I typically find: complex PTSD due to multiple combat exposures; complex grief; TBI in some; and SUD. I do agree that treatment is challenging.

    And it is crucial to differentiate OCD from OC Personality D/O.

    I find that group therapy over a period of time to be quite efficacious as it recapitulates the essential psychosocial unit, the squad.

  • I know I have PTSD the severity of it is high I have not done an assessment for OCD because my psychiatrist or Psychologist never addressed or asked any questions leading up to or it just never dawned on them

Add new comment

PHCoE welcomes your comments.

Please do not include personally identifiable information, such as Social Security numbers, phone numbers, addresses, or e-mail addresses in the body of your comment. Comments that include profanity, personal attacks, or any other material deemed inappropriate by site administrators will be removed. Your comments should be in accordance with our full comment policy regulations. Your participation indicates acceptance of these terms.

All ideas will be considered, but may not be accepted.