Cortisol and hypothalamic-pituitary-gonadal axis hormones in follicular-phase women with fibromyalgia and chronic fatigue syndrome and effect of depressive symptoms on these hormones. — CFSMEATLAS
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Cortisol and hypothalamic-pituitary-gonadal axis hormones in follicular-phase women with fibromyalgia and chronic fatigue syndrome and effect of depressive symptoms on these hormones.
Gur, Ali, Cevik, Remzi, Nas, Kemal et al. · Arthritis research & therapy · 2004 · DOI
Quick Summary
This study examined hormone levels in women with fibromyalgia and ME/CFS, comparing them to healthy women. Researchers found that women with both conditions had lower cortisol (a stress hormone) than healthy controls, but other reproductive hormones were similar across groups. Depression symptoms appeared to be connected to even lower cortisol levels, though it's unclear whether depression causes low cortisol or low cortisol contributes to depression.
Why It Matters
Understanding hormone dysregulation in ME/CFS—particularly cortisol abnormalities—could help explain fatigue, cognitive dysfunction, and mood symptoms. This work highlights potential links between neuroendocrine dysfunction and depression in ME/CFS, important for developing targeted treatments and distinguishing biological from psychological contributions to illness.
Observed Findings
Cortisol levels were significantly lower in fibromyalgia and ME/CFS patients compared to healthy controls (P < 0.05).
In ME/CFS patients specifically, low cortisol was observed regardless of depression score (P < 0.05).
In fibromyalgia patients, low cortisol was significantly associated with high depression scores (P < 0.05).
No significant differences in FSH, estradiol, progesterone, or prolactin were found between the three groups.
Among patients without depressive symptoms, cortisol levels were significantly lower in CFS than in fibromyalgia (P < 0.05).
Inferred Conclusions
Morning cortisol is reduced in both fibromyalgia and ME/CFS, suggesting a biological abnormality in the hypothalamic-pituitary-adrenal axis in both conditions.
Depression may compound cortisol reduction in fibromyalgia, whereas low cortisol appears to be a primary feature of ME/CFS independent of mood.
Hypothalamic-pituitary-gonadal axis dysfunction in these conditions is limited and may be secondary to depression or other factors, not a primary endocrine abnormality.
Remaining Questions
Does low cortisol contribute to the development of depression in ME/CFS, or does depression secondarily lower cortisol levels?
What This Study Does Not Prove
This study cannot establish whether low cortisol causes depression or vice versa, nor can it prove causation in any direction given its cross-sectional design. The findings are limited to women in the follicular phase and may not generalize to luteal-phase women or men. A single morning cortisol measurement does not assess the full 24-hour cortisol rhythm, which may be disrupted in ME/CFS.
Tags
Symptom:PainFatigue
Biomarker:Blood Biomarker
Method Flag:PEM Not DefinedWeak Case DefinitionExploratory OnlySex-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 →