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Aim and Background: The present study aimed to investigate the role of meta-cognitive beliefs, personality type D, and psychological well-being in the prediction of symptoms severity in psoriasis. Methods and Materials : This was a descriptive correlational study. The research population consisted of all individuals who referred to skin clinics in Kermanshah, Iran, for the treatment of psoriasis in 3014. The participants consisted of 115 individuals who were selected through convenience sampling. Among the participants, 51 were men. After the completion of the Psoriasis Area and Severity Index (PASI) by a physician, the Type D personality scale, Ryff’s Psychological Well-Being Questionnaire, the Meta-Cognition Questionnaire (Cartwright Hutton and Wales) were completed by the subjects. Findings: Meta-cognitive beliefs and type D personality had a significant negative relationship with psychological well-being. Moreover, meta-cognitive beliefs and personality type D predict the severity of psoriasis symptoms through the reduction of psychological well-being. Conclusions: The enhancement of individual well-being in all its components through appropriate psychological training interventions can help to speed up the treatment of patients with this disease.

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Aim and Background: Chronic diseases not only may cause cognitive and psychological problems in affected individuals but also may harm their physiological recovery process. Thus, the current study aimed at investigating the efficacy of Acceptance and Commitment Therapy on quality of life and type D personality of patients with ulcerative colitis.
Methods and Materials: The research method was semi-experimental with a pretest-posttest design and a control group and a two-month follow-up. The statistical population included patients with ulcerative colitis who were referred to the Digestion and Liver Research Center (affiliated with Alzahra Hospital) in the autumn and winter of 2019-20. Twenty-five patients with ulcerative colitis were recruited using the purposive sampling method and randomly assigned to either an experimental group or a control group. The experimental group received eight seventy-five-minute sessions of Acceptance and Commitment Therapy for two months. The questionnaires administered in this study included the World Health Organization quality of life assessment (World Health Organization, 1994) and Type D personality (Denollet, 2005). The data were analyzed using mixed ANOVA via the SPSS 23 software.
Findings: The results showed that Acceptance and Commitment Therapy had significant effects on the quality of life and type D personality in patients with ulcerative colitis (p <.001).
Conclusions: According to the findings of the current study, Acceptance and Commitment Therapy can be used as an effective intervention to improve quality of life and decrease characteristics of type D personality in patients with ulcerative colitis through applying the six main processes, including acceptance, diffusion, context as self, relationship with the present time, values and committed activities.