Endometriosis genetics just took a leap: what the largest-ever DNA study means

What the study did

The study, led by researchers at Yale University, the University of Barcelona and the Sant Pau Research Institute with international collaborators, was a genome-wide association study (GWAS). That means it scanned the DNA of a very large number of people to find genetic variants that are more common in those with a condition (Koller et al., 2026).

It analysed genetic data from around 1.4 million women, including 105,869 with endometriosis, drawn from major biobanks and research cohorts in the US, Europe and Japan, including the UK Biobank, FinnGen, the Estonian Biobank, BioBank Japan, the US All of Us and Million Veteran Program, and 23andMe research participants. Importantly, it included women from several ancestries, whereas much earlier genetic research focused largely on women of European descent.

What it found

• 80 regions of the genome associated with endometriosis risk — 37 of them newly discovered. The previous largest study, in 2023, had identified 42 (Rahmioglu et al., 2023).
• 5 of the new regions were also associated with adenomyosis, endometriosis's close relative, where endometrial-like tissue grows into the muscle of the womb.
• For more than 50 of the associations, the researchers identified likely causal genetic variants — narrowing down which specific changes may matter.
• Additional analyses linked endometriosis risk to biological pathways involved in cell differentiation, immune and hormonal regulation, tissue remodelling and inflammation.
• Some genetic effects differed between ancestry groups — a reminder of why diverse research populations matter.
• Genetic risk interacted with symptoms such as abdominal pain, anxiety, migraine and nausea, suggesting genetics may influence how the disease shows up, not just whether it develops.
• Drug-repurposing analyses highlighted existing medicines — currently used for breast cancer, contraception and preventing preterm birth — as potential candidates to investigate for endometriosis.

This study nearly doubles the known genetic map of endometriosis and gives scientific weight to what many of us have long said: this is a whole-body disease involving the immune system and inflammation, not just a 'gynaecological' problem.

Why genetics matters in endometriosis

Endometriosis runs in families. Twin studies estimate that around half of the variation in risk is due to genetic factors (Treloar et al., 1999; Saha et al., 2015). That doesn't mean there is a single 'endo gene'. Instead, many common variants, each with a small effect, add up to influence risk, alongside hormonal, immune and environmental factors.

For years, researchers have debated how endometriosis develops. The pathways highlighted by this study — immune regulation, inflammation and tissue remodelling — support the growing view of endometriosis as a chronic systemic disease rather than one confined to the pelvis (Taylor et al., 2021).

How to read genetics headlines

A few things are worth keeping in mind whenever you see a big genetics story. A GWAS finds regions of the genome associated with a condition; it doesn't automatically tell us which gene in that region matters or how. Each individual variant usually has a very small effect on risk. And association isn't the same as causation — follow-up laboratory and clinical work is needed to understand what these regions actually do.

It is also good practice to look at who did the research and how it was funded. This study was published in a leading peer-reviewed journal and the authors declared their competing interests, including one author's involvement in companies developing new endometriosis treatments and diagnostics. That kind of transparency is normal and doesn't invalidate the findings, but it is a useful habit to check.

What it could mean in the future

• Earlier diagnosis: diagnosis still takes many years in several countries (Hudelist et al., 2012). In future, genetic risk information combined with symptoms might help doctors identify who needs investigating sooner. That is a research goal, not a current tool.
• Personalised care: because genetic risk appears to interact with particular symptoms, it may eventually help explain why endometriosis looks so different from one woman to the next, and guide more tailored treatment.
• Treatments beyond hormones: most current medical treatments for endometriosis work by suppressing hormones, which doesn't suit everyone, especially women trying to conceive. Identifying immune, inflammatory and tissue-remodelling pathways opens up new possible targets. The drug-repurposing findings are starting points for further research — not recommendations to use those medicines for endometriosis.
• Validation: for women who have been told for years that their pain is normal or exaggerated, evidence of a substantial genetic basis is a powerful reminder that endometriosis is a real biological disease.

What it doesn't change yet

This is the part headlines tend to skip. Right now:

• There is no genetic test that can diagnose endometriosis. Diagnosis still relies on symptoms, examination, imaging and, in some cases, laparoscopy (NICE, NG73).
• Genetic risk scores are not ready for clinical use. They can show differences between groups in research, but they can't yet reliably predict whether an individual woman will develop endometriosis.
• No new treatments have been approved as a result of this study. Any repurposed drugs would need to go through clinical trials to show they are safe and effective for endometriosis.
• Current care is unchanged: specialist surgery, hormonal and non-hormonal medical options, pain management, pelvic physiotherapy, mental health support and nutrition all remain important.
• Your genes are not your destiny. Having genetic risk factors doesn't mean you will develop endometriosis, and not having them doesn't mean you won't.

If you have symptoms of endometriosis, don't wait for a genetic test. Push for assessment based on your symptoms now.

What you can do today

Know your family history. If your mother, sister or aunt has endometriosis, or had very painful periods, tell your doctor — family history is still one of the most useful pieces of information we have.

Track your symptoms, including pain, bowel and bladder symptoms, fatigue, migraine and mood, as these can help build the picture. And look after the systems this research highlights: an anti-inflammatory, fibre-rich diet, steady blood sugar, sleep, stress support and gentle movement won't change your genes, but they can support how your body lives with endometriosis. I've written a full guide to the endometriosis diet if you want to go further.

Genetic research moves slowly from discovery to the clinic, but this study is a real step forward. For the first time, we have a much clearer map of the biology behind endometriosis — and that is where better care begins.

Before you act on any of this

This article is for education and general information only. It isn't medical advice, it can't diagnose or treat any condition, and it doesn't replace a consultation with your own doctor or a qualified practitioner who knows your history. Please don't start, stop or change any medication, hormone or supplement because of something you've read here — take your questions to the person responsible for your care.

This study is early-stage research. Please don't start, stop or change any treatment for endometriosis based on these findings — discuss any questions with your gynaecologist or GP.

References

• Hudelist, G., Fritzer, N., Thomas, A., et al. (2012). Diagnostic delay for endometriosis in Austria and Germany: causes and possible consequences. Human Reproduction, 27(12), 3412–3416.
• Koller, D., He, J., Løkhammer, S., et al. (2026). Multi-ancestry genome-wide association and integrated multi-omics analyses of endometriosis and its clinical manifestations. Nature Genetics. Published 29 April 2026. doi:10.1038/s41588-026-02582-2.
• National Institute for Health and Care Excellence. Endometriosis: diagnosis and management (NG73). London: NICE.
• Rahmioglu, N., Mortlock, S., Ghiasi, M., et al. (2023). The genetic basis of endometriosis and comorbidity with other pain and inflammatory conditions. Nature Genetics, 55(3), 423–436.
• Saha, R., Pettersson, H.J., Svedberg, P., et al. (2015). Heritability of endometriosis. Fertility and Sterility, 104(4), 947–952.
• Taylor, H.S., Kotlyar, A.M., & Flores, V.A. (2021). Endometriosis is a chronic systemic disease: clinical challenges and novel innovations. The Lancet, 397(10276), 839–852.
• Treloar, S.A., O'Connor, D.T., O'Connor, V.M., & Martin, N.G. (1999). Genetic influences on endometriosis in an Australian twin sample. Fertility and Sterility, 71(4), 701–710.