Few, J, Thompson, N W, Angelos, P et al. · Surgery · 1996 · DOI
Riedel's thyroiditis is a rare disease where fibrous tissue hardens in the thyroid gland, causing breathing problems, difficulty swallowing, and chronic fatigue. This small study found that four patients with this condition improved significantly when treated with a drug called tamoxifen, even though surgery and steroid medications had not worked well before.
While this study addresses Riedel's thyroiditis rather than ME/CFS directly, it is relevant because some ME/CFS patients report debilitating fatigue and inflammatory-fibrotic complications. Understanding novel anti-inflammatory and anti-fibrotic drug mechanisms like tamoxifen may inform investigation of similar pathways in ME/CFS-related systemic dysfunction.
This study does not establish that Riedel's thyroiditis causes ME/CFS, nor does it prove tamoxifen would be effective for primary ME/CFS. The case series design with no control group cannot determine causality or rule out placebo effect, and the small sample size (four patients) limits generalizability. The study also does not clarify whether improvement in fatigue symptoms resulted from resolution of thyroid dysfunction or from a direct anti-inflammatory effect.
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 →
Spotted an error in this entry? Report it →