Abstract
Background
Widespread pain is a common comorbidity in several chronic diseases and is suspected to be caused by the underlying disease that has provoked a state of central sensitization. However, this argument is currently limited by evidence that has not sufficiently captured the temporal nature of the relationship between diagnosis of the underlying disease and onset of widespread pain. The aim of this study was to investigate whether patients with rheumatoid arthritis (RA), endometriosis or inflammatory bowel disease (IBD) have a higher risk of developing widespread pain (fibromyalgia or chronic widespread pain [CWP]).
Methods
Using the Swedish Skåne Healthcare Register of healthcare consultation, a cohort of 889,938 adult patients were followed from 2007‐2016, and incident cases of RA, endometriosis or IBD and of fibromyalgia and CWP were identified by registered diagnoses. Using Poisson regression, we calculated incidence rate ratios (IRR) adjusted for sex, age, education, and propensity to seek health care.
Results
For patients with RA, the IRR for later fibromyalgia was 3.64 (95% CI: 2.75‐4.81) compared to patients without RA, and for CWP the figure was 2.96 (95% CI: 1.81‐4.86). For endometriosis patients, the IRR for fibromyalgia was 2.83 (95% CI: 1.96‐4.08) and for CWP 5.02 (95% CI: 3.10‐8.13). IRR for IBD patients was 2.32 (95% CI: 1.58‐3.42) for fibromyalgia and 1.42 (95% CI: 0.93‐2.17) for CWP.
Conclusions
This study shows that RA, endometriosis and IBD are all risk factors for later fibromyalgia and chronic widespread pain, consistent with a hypothesis of central sensitization as an effect of a painful underlying condition.
from Wiley: European Journal of Pain: Table of Contents http://bit.ly/2QqmMkt
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