Background
Fibromyalgia (FM) patients commonly report functional disability and cognitive complaints. We aim to assess the effect of cognitive complaints on FM patients’ functionality. 

Methods
438 FM patients (ACR 2010 criteria) completed the item I.2 of the Fibromyalgia Survey Questionnaire (FSQI.2) to report cognitive complaints, and the Spanish version of the Fibromyalgia Impact Questionnaire (S-FIQ) to inform their functionality and quality of life. Sociodemographic and health determinants data were also collected.
Results
85.8% of FM patients reported cognitive complaints in the FSQI.2. Patients with and without cognitive complaints were comparable in age, education and body mass index, but differed in all S-FIQ scores (patients with cognitive complaints being worse): physical functioning (t[432] = -4.27, p = .00), well-being (t[419] = -4.02, p = .00), work difficulty (t[418] = -3.95, p = .00), functionality (t[425] = -4.94, p= .0017), pain (t[429] = -5.42, p = .00), fatigue (t[431] = -5.16, p = .00), morning tiredness (t[426] = -3.64, p = .00), stiffness (t[429] = -6.29, p = .00),  anxiety (t[432] = -5.94, p = .00) depression (t[433] = -6.09, p = .00), and total (t[433] = -7.31, p = .00).
Conclusions
There is a high prevalence of cognitive complaints in FM patients, associated with a wide functional impact regardless of age, education or physical condition. Cognitive complaints must be considered in FM treatment approaches to improve the functionality and quality of life of patients.

FUNCTIONAL IMPACT OF COGNITIVE COMPLAINTS IN FIBROMYALGIA PATIENTS