Internet-based acceptance and commitment therapy for transdiagnostic treatment of comorbid posttraumatic stress disorder and chronic pain: A development pilot study.

Objective: Acceptance and commitment therapy (ACT) is a transdiagnostic, behavioral treatment focusing on common processes behind different diagnoses. Internet-based treatment programs can improve access to treatment and easily be integrated into the individual's life.

Method: This single-arm, pre-post-follow-up pilot study examined the acceptability, safety, and effectiveness of internet-based ACT (iACT) for participants with comorbid posttraumatic stress disorder (PTSD) and chronic pain treated at a tertiary pain clinic. All participants (N = 10) received the iACT program over a period of 10 weeks and were assessed pre- and postintervention and at a 3-month follow-up.

Results: This study provides preliminary evidence for the acceptability, safety, and effectiveness of iACT for comorbid PTSD and chronic pain. The program showed clinically significant improvement in relation to the primary outcomes PTSD symptom severity and pain interference for this patient group with complex, comorbid symptoms, with sustained effects at the 3-month follow-up.

Conclusions: These results add to previous research where face-to-face ACT has been shown to be of benefit to individuals with either chronic pain or PTSD. The findings also suggest that iACT can be delivered to individuals with comorbid PTSD and chronic pain with an effectiveness that is comparable to other cognitive behavioral therapy-based treatments for somatic and psychiatric disorders. (PsycInfo Database Record (c) 2025 APA, all rights reserved).