E2 ModerateModerate confidencePEM not requiredCross-SectionalPeer-reviewedMachine draft
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Endometriosis is associated with prevalence of comorbid conditions in migraine.
Tietjen, Gretchen E, Bushnell, Cheryl D, Herial, Nabeel A et al. · Headache · 2007 · DOI
Quick Summary
This study found that women with migraines who also have endometriosis (a painful condition affecting the uterus) experience more frequent and severe headaches than women with migraines alone. Women with both conditions were also more likely to have other related conditions like chronic fatigue syndrome, anxiety, and bladder pain. The findings suggest these conditions may share common underlying factors, possibly related to hormones.
Why It Matters
This study is relevant to ME/CFS patients because it documents that CFS is significantly more prevalent in women with both migraine and endometriosis (3.6-fold higher odds), suggesting shared pathophysiological mechanisms—possibly hormonal dysregulation, central sensitization, or neuroinflammation. Understanding these comorbidity patterns may help researchers identify common etiologic factors and clinicians recognize underdiagnosed conditions in complex patient presentations.
Observed Findings
Endometriosis was reported in 22% of migraineurs vs. 9.6% of controls (P<0.01).
Migraineurs with endometriosis had higher headache frequency and median disability scores compared to those without endometriosis (P=0.002 and P=0.025, respectively).
CFS was more common in migraine with endometriosis vs. migraine without endometriosis (OR=3.6, 95% CI 1.1–11.5).
Interstitial cystitis showed the strongest association with migraine plus endometriosis (OR=10.6, 95% CI 1.9–56.5).
Anxiety, depression, IBS, and fibromyalgia were all more prevalent in the migraine-with-endometriosis group compared to controls.
Inferred Conclusions
Endometriosis prevalence is significantly elevated in women with migraine, suggesting a true epidemiologic association rather than chance occurrence.
Women with comorbid migraine and endometriosis represent a more severely affected subgroup with greater headache burden and higher rates of multiple pain and mood disorders.
Hormonal factors (ovarian hormone sensitivity) may underlie the shared pathophysiology of migraine, endometriosis, CFS, and related comorbidities.
Remaining Questions
What are the specific biological mechanisms linking endometriosis, migraine, CFS, and pain conditions—and do they involve estrogen sensitivity, neuroinflammation, or central sensitization?
What This Study Does Not Prove
This study does not establish causation or explain why endometriosis, migraine, and CFS co-occur; it only documents higher prevalence in women with multiple conditions. The cross-sectional design cannot determine temporal relationships or whether one condition predisposes to others. Additionally, the study relies on self-reported endometriosis diagnosis without surgical confirmation, which may underestimate or misclassify true prevalence.
Tags
Symptom:PainFatigue
Method Flag:Weak Case DefinitionSmall SampleSex-Stratified
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 →