What causes estrogen dominance with endometriosis?

“Estrogen dominance” in endometriosis usually isn’t just about making too much estrogen overall—it’s more often about an estrogen-favoring environment in the pelvis and within the lesions themselves. Many endometriosis lesions can produce estrogen locally (for example, through higher aromatase activity), and that local estrogen can help lesions survive, inflame surrounding tissue, and stimulate nerve growth that drives pain. At the same time, endometriosis commonly behaves as a chronic inflammatory condition, and inflammation can reinforce estrogen signaling and keep the cycle going.

Another key piece is that endometriosis often shows a weaker response to progesterone (“progesterone resistance”), so the normal hormonal braking system that should counterbalance estrogen doesn’t work as well. This can make symptoms feel very hormone-driven even when blood hormone labs look “normal.” Because endometriosis is multifactorial and likely includes different subtypes, the specific drivers of estrogen dominance can vary from person to person—genetics/epigenetics, immune dysfunction, and tissue-level changes can all play a role. If you’re trying to make sense of your symptoms or why hormonal suppression hasn’t brought lasting relief, our team can help you sort out what may be driving your disease and discuss options that focus on treating the endometriosis itself, not just temporarily quieting it.