Non-inflammatory pain in inflammatory arthritis

Area of Science:

• Rheumatology
• Pain Medicine
• Neuroscience

Background:

• Non-inflammatory pain is prevalent in rheumatoid arthritis (RA), often due to co-occurring fibromyalgia.
• Fibromyalgia affects approximately 20% of RA patients, leading to higher disease activity scores and treatment challenges.

Approach:

• Systematic review of existing literature on fibromyalgia in RA.
• Exploration of epidemiological data and potential pathogenic mechanisms.
• Discussion of clinical impact and implications for treatment.

Key Points:

• Fibromyalgia is frequently observed in RA patients, potentially as a secondary condition rather than merely concomitant.
• The prevalence of fibromyalgia is higher in RA than in the general population.
• Potential mechanisms include inflammatory cytokines, chronic pain-induced temporal summation, and impaired coping due to poor sleep and mental well-being.

Conclusions:

• Fibromyalgia significantly impacts RA management, contributing to difficulties in achieving treatment targets.
• Further research into the mechanisms of secondary fibromyalgia in RA is crucial for developing targeted therapeutic strategies.
• Addressing fibromyalgia could improve outcomes for patients with difficult-to-treat RA.