The frequency of fibromyalgia in patients with systemic lupus erythematosus and associated factors: a systematic review and meta-analysis

Fibromyalgia (FM) in systemic lupus erythematosus (SLE) patients contributes to increased fatigue, anxiety, depression, and mental exhaustion. This study's objective is to systematically review the literature and to determine the frequency of FM in patients with SLE and its associated factors. A literature review was conducted to assess the prevalence of FM in SLE patients and to identify FM-associated factors. This involved searching the PubMed and Cochrane Library databases from 1959 to 2023. Cohorts, case-control, and population-based studies were included, while those not focusing on FM rates in SLE patients were excluded. Data on FM-associated factors and FM frequency in control or connective tissue disease (CTD) groups were obtained if available. Secondary analyses compared FM frequencies in SLE and other groups (healthy controls or CTD groups). Fifty-six studies met the eligibility criteria. Out of the 56 studies, nine included comparative data between SLE patients and healthy controls, while six presented data comparing the frequency of FM in patients with SLE and other CTDs. The combined cohorts included 58,052 SLE patients. Among 5063 SLE patients, FM was detected. The overall random-effects pooled prevalence of FM was 15.8% (95% CI, 13.4-18.5) with high heterogeneity (I², 97.9%). Our analysis revealed a significantly higher risk of FM in patients with SLE compared to controls (OR, 3.7; 95% CI, 2.74-5.0). There was a higher risk of FM in SLE patients compared to other rheumatic diseases, but the difference was not significant. Our study showed that the prevalence of FM is higher in patients with SLE compared to the general population. FM in SLE may act as a confounding factor when assessing disease activity and treatment response. Research results indicate that concurrent FM is a frequent comorbidity in SLE, emphasizing the importance of recognizing its occurrence in SLE patients.