Personality and psychopathology heterogeneity in MMPI-2 and health-related features in fibromyalgia patients.

Personality and psychopathology features may play an important role as predisposing factors for fibromyalgia (FM). However, psychological heterogeneity of FM patients has been suggested. Based on two personality psychopathology clusters, we intend to explore psychological heterogeneity in FM patients, specifically, to identify if personality features had other psychological and psychopathological correlates. Secondarily, we also want to identify if personality features have association with health-related correlates. The participants were female FM patients (n = 56) between 30 and 60 years old. The instruments were: Minnesota Multiphasic Personality Inventory (MMPI-2) content and supplementary scales, Fibromyalgia Impact Questionnaire (FIQ), and Numerical Rating Scale (NRS-11). Multivariate analyses of variance (MANOVAs) identified that Cluster 2 (n = 24), characterized by a combination of negative affectivity and social inhibition, presented a more disturbed profile, with several features of symptomatic behavior, general maladjustment, and important clinical problem areas. The associations of personality variables with FM impact and self-reported pain are null, with the exception of Disconstraint scale. In conclusion, FM patients may be very different at the psychological level, concerning personality and psychopathological features that may compromise their treatment. Personality and health-related dimensions do not seem to be associated.