Fibromyalgia and nonfibromyalgia chronic pain: Differences in psychological characteristics and treatment outcomes.

The aim of this study was to explore differential psychological profiles among patients with chronic pain with and without fibromyalgia, and to determine the results of the cognitive behavioral therapy (CBT) for pain. Thirty patients with chronic pain and 60 patients with fibromyalgia were referred to 10 weekly sessions of CBT in a general hospital and were evaluated in pain-related variables, psychopathological symptoms, coping strategies, resilience, and quality of life. The program was implemented in specific groups for patients with fibromyalgia and nonfibromyalgia chronic pain. After the intervention, patients with fibromyalgia showed higher levels of psychopathology, rated their health status as poorer, and presented larger amplification of symptoms, higher levels of somatization, a more ruminating style of thinking and greater distress. Patients without fibromyalgia achieved better therapeutic results in both pain intensity (d = 0.39 vs. d = 0.12) and psychopathological distress (d = 0.77 vs. d = 0.11) compared to patients with fibromyalgia. Therefore, differential profiles and limited therapeutic results in fibromyalgia patients suggest the need to outline differentiated treatments and include other therapeutic strategies.