Increased risk of chronic fatigue syndrome following psoriasis: a nationwide population-based cohort study.
Tsai, Shin-Yi, Chen, Hsuan-Ju, Chen, Chi et al. · Journal of translational medicine · 2019 · DOI
Quick Summary
This study found that people with psoriasis (a skin condition involving immune system dysfunction) have a higher chance of developing ME/CFS compared to people without psoriasis. Researchers followed over 13,000 people in Taiwan for several years and found that those with psoriasis were about 1.5 times more likely to develop ME/CFS. Interestingly, people who received certain psoriasis treatments appeared to have a lower risk of developing ME/CFS.
Why It Matters
This study provides population-level evidence linking a systemic immune condition (psoriasis) to ME/CFS risk, supporting the hypothesis that immune dysregulation may contribute to ME/CFS development. The finding that certain treatments reduce CFS risk suggests potential pathways for understanding and possibly preventing ME/CFS in susceptible populations.
Observed Findings
People with psoriasis had 1.48 times higher risk of developing ME/CFS (adjusted hazard ratio).
Male psoriasis patients showed particularly elevated CFS risk (2.05 times higher).
Psoriasis patients aged 60 or older had 2.32 times higher CFS risk.
Incidence rate of CFS was 3.58 per 1000 person-years in psoriasis group vs 2.27 in controls.
Psoriasis is associated with elevated subsequent risk of ME/CFS, with effects varying by sex and age.
Immune-modulating treatments for psoriasis may reduce the risk of developing ME/CFS.
Immune dysregulation in psoriasis may represent a risk factor for ME/CFS pathogenesis.
Remaining Questions
What specific mechanisms link psoriasis and ME/CFS—shared genetic factors, common immune triggers, or direct pathophysiological causation?
Why do males and older adults with psoriasis show higher CFS risk?
Which immunomodulatory agents are most protective against ME/CFS development, and what does this reveal about ME/CFS pathogenesis?
What This Study Does Not Prove
This study demonstrates association, not causation—psoriasis does not necessarily cause ME/CFS. The findings are specific to a Taiwanese population and may not generalize to other ethnic groups. The study cannot determine whether shared genetic factors, common triggering mechanisms, or the psoriasis itself drives the increased risk.