Ali Bakhshi Bajestani - PhD Student, Department of Psychology, Birjand Branch, Islamic Azad University, Birjand, Iran.
Fatemeh Shahabizadeh - Associate Professor, Department of Psychology, Birjand Branch, Islamic Azad University, Birjand, Iran.
Shahram Vaziri - Associate Professor, Department of Psychology, Roodehen Branch, Islamic Azad University, Roodehen, Iran.
Farah Lotfi Kashani - Associate Professor, Department of Psychology, Roodehen Branch, Islamic Azad University, Roodehen, Iran.

Background: Anxiety disorders and psychological manifestations play a significant role in the incidence of psychosomatic disorders. Moreover, Personality traits are one of the psychological constructs associated with psychosomatic symptoms. Objective: This study aimed to determine the effectiveness of acceptance and commitment therapy on distress and psychosomatic symptoms in patients with gastrointestinal dysfunction with type D personality.Methods: The present study was a semi-experimental pre-test, post-test design with a control group and follow-up. The statistical population in this study was all patients with functional gastrointestinal disorders (FGID) who were referred to behavioral sciences research center in Isfahan in ۲۰۱۹, ۳۰ patients were selected by targeted sampling method (patients with gastrointestinal dysfunction, except gastrointestinal cancer patients, who had a high de-personality score). Data were obtained using the D-۱۴ personality type scale, ROME III questionnaire, psychological distress, and stress-anxiety-depression disorders (DASS-۲۱). Data analysis was performed using repeated measure analysis of variance by spss.۲۲. Results: The results showed that acceptance and commitment therapy was effective in decreasing distress (p <۰.۰۰۱) and psychosomatic symptoms (p <۰.۰۰۱) in patients with gastrointestinal dysfunction with type D personality. Conclusion: It can be concluded that acceptance and commitment therapy effectively distress and psychosomatic symptoms of patients with gastrointestinal dysfunction with type D personality and improve psychological problems in patients with gastrointestinal dysfunction.

Acceptance and Commitment Therapy, Type D Personality, Psychophysiologic Disorders, Gastrointestinal Diseases