E2 ModeratePreliminaryPEM not requiredCase-ControlPeer-reviewedReviewed
Standard · 3 min
Bladder pain syndrome/interstitial cystitis is associated with hyperthyroidism.
Chung, Shiu-Dong, Liu, Shih-Ping, Lin, Ching-Chun et al. · PloS one · 2013 · DOI
Quick Summary
This study found that women with bladder pain syndrome/interstitial cystitis (BPS/IC) are more than twice as likely to have had hyperthyroidism (an overactive thyroid) compared to women without bladder pain. The researchers reviewed medical records from Taiwan and suggest that doctors treating women with thyroid problems should ask about urinary symptoms.
Why It Matters
This research is relevant to ME/CFS because both conditions share autonomic nervous system dysfunction and frequently co-occur with other comorbidities including thyroid disorders. Understanding the link between endocrine dysfunction and pain/bladder syndromes may help explain overlapping mechanisms in ME/CFS and related conditions, potentially guiding screening and treatment approaches.
Observed Findings
3.3% of BPS/IC cases had prior hyperthyroidism compared to 1.5% of controls (p<0.001)
Unadjusted odds ratio for prior hyperthyroidism in cases was 2.16 (95% CI: 1.27–3.66)
Adjusted odds ratio after controlling for 15 comorbidities remained significant at 2.01 (95% CI: 1.15–3.53)
Study population consisted of 736 BPS/IC cases and 2,208 matched female controls
Inferred Conclusions
An association exists between prior hyperthyroidism diagnosis and BPS/IC in women
The relationship persists after adjustment for multiple confounding comorbidities including chronic fatigue syndrome and fibromyalgia
Clinicians should be alert to urinary symptoms in female patients with hyperthyroidism history
Autoimmune and autonomic nervous system dysfunction may represent a shared pathophysiological mechanism
Remaining Questions
Does hyperthyroidism directly cause or contribute to BPS/IC development, or do both conditions share a common underlying etiology?
What is the temporal relationship—does hyperthyroidism precede BPS/IC onset, and by how long?
What This Study Does Not Prove
This study demonstrates association, not causation—hyperthyroidism may not cause BPS/IC, and both may result from a shared underlying process. The study is limited to Taiwan's healthcare database and primarily captures women with access to care, so findings may not generalize universally. The cross-sectional nature means temporal relationships between hyperthyroidism diagnosis and BPS/IC onset cannot be definitively established.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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Are the elevated rates of other autonomic-related comorbidities (CFS, fibromyalgia, IBS) in BPS/IC patients similarly associated with thyroid dysfunction?
Do treatment of hyperthyroidism or thyroid replacement therapy affect BPS/IC symptom severity or incidence?