Adenomyosis and Pain
Adenomyosis causes pelvic pain through mechanisms including abnormal contractility, altered oxytocin and prostaglandin expression, and nerve fiber changes, with its pain severity increasing when combined with endometriosis.
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This chapter reviews what is known about adenomyosis-related pain, including affected mechanisms such as abnormal uterine contractility, oxytocin receptor (OTR) expression, prostaglandin and COX-2 expression, altered growth/distribution of local nerve fibers, neuropeptides, macrophages, and inflammatory mediators, noting that the causes of pain remain unclear. It also describes how adenomyosis combined with endometriosis—particularly deep infiltrating endometriosis—can be associated with more severe dysmenorrhea and a likelihood of progressive dysmenorrhea, while acknowledging that additional unknown mechanisms may exist. A major limitation is that the discussion is based on accumulating evidence across studies and explicitly states that mechanisms are not fully elucidated. This paper is centrally about adenomyosis—specifically the mechanisms proposed to explain adenomyosis-associated pain and the interaction with endometriosis in pain severity.
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