Endometriosis and the Gut: What the Latest Research Tells Us
This isn't just a clinical interest for me. I have watched someone I love deeply navigate more than a decade of endometriosis, the years of being fobbed off, the antibiotics prescribed without any clear rationale, the hormonal medications that brought their own mental torment without easing the underlying disease, and the eventual decision to go privately just to get an answer. The diagnosis, when it finally came, was a relief. But it also came with surgeries that didn’t work and the quiet devastation of realising there was no roadmap, no lasting treatment plan, and no cure being offered.
Earlier this month, BBC journalist and broadcaster Emma Barnett aired the UK's first major television documentary on endometriosis: Emma Barnett: Fighting Endometriosis (BBC Two, 1 June 2026). In her accompanying article for The Independent she wrote what many of us in women's health have long been saying: "Although it is as common as diabetes, endometriosis receives a fraction of the research funding." In her interview with then Health Secretary Wes Streeting, conducted just weeks before his resignation, he admitted his surprise that a proper NHS pathway for the condition did not exist. "Yes, that should exist. I accept that," he acknowledged.
It is a remarkable admission, and a damning one. Yet for the 1 in 10 women and those assigned female at birth living with endometriosis in the UK, it will come as no surprise at all.
The Reality of Living with Endometriosis
If you have endometriosis, you already know what it feels like. You know the kind of pain that does not respond to paracetamol and a hot water bottle. You know the cancelled plans, the days lost to bed, the invasive tests that come back "normal", hours in A&E unable to stand to be given morphine and sent home and the calls to the GP where your concerns are minimised or dismissed and often not even allocated appointments by the triage system. Emma Barnett described it as "bone-grinding agony." That language matters. It names an experience that too many women have been told is simply part of being female.
I watched this happen first-hand. Years of being told it was period pain. Antibiotics issued as a precaution rather than with purpose. The suggestion, implicit and sometimes explicit, that the pain was being exaggerated. What I observed across those years was not unusual, as the data we are now seeing makes painfully clear.
The statistics tell a story that should make every policymaker stop in their tracks. The average time to receive a diagnosis of endometriosis in the UK is now 9 years and 4 months — up from 8 years in 2020, according to the Endometriosis UK State of Care Report 2025/2026. For women from ethnically diverse communities, that figure rises to 11 years on average. These are not statistics. They are nearly a decade of someone's life spent in pain, confusion, and far too often, self-doubt.
The same report found that 82% of respondents had been told by a healthcare professional that they were "making a fuss about nothing" or given a similarly dismissive response. Ninety-eight per cent reported that endometriosis had affected their mental health. More than half - 55% - visited A&E due to their symptoms before receiving a diagnosis, and half of those were sent home without any treatment or meaningful support.
At the start of 2026, almost three-quarters of a million women are currently waiting for gynaecology care in the UK according to the Endometriosis UK State of Care Report 2025/2026. The NHS Confederation estimates that endometriosis and related menstrual health conditions cost the UK economy £11 billion a year through absenteeism alone. From 2018/19 to 2023/24, UKRI and the NIHR invested just £14.92 million in endometriosis research - a figure that, when set against the scale of suffering and economic cost, is not a funding level. It is an afterthought.
Endometriosis UK is calling for the average diagnosis time to be reduced to one year or less by 2030. That goal is achievable, but only with political will, structural reform, and serious investment. I add my voice, firmly, to that call.
A Call for Urgent Government Action
The situation demands more than sympathy. We need:
- Dedicated, ring-fenced funding for endometriosis research, at a level commensurate with the condition's prevalence and economic impact — comparable to the national action plans established by France and Australia
- A national endometriosis action plan that sets binding targets and accountability measures
- A formal NHS pathway for endometriosis, so that no woman is told the system doesn't have one
- A commitment to reducing diagnosis time to one year or less by 2030, as called for by Endometriosis UK
- Targeted investment in addressing health inequalities, so that Black, Asian, and other ethnically diverse women are no longer waiting two years longer than the national average for answers
As Emma Barnett noted in her documentary, Wes Streeting expressed openness to looking at what France and Australia have done to fund dedicated endometriosis action. The new Health Secretary now has both the evidence and the precedent. It is time for commitment, not consultation.
What Does Gut Health Have to Do with Endometriosis?
This is where nutritional science has something genuinely important to offer. Over the past few years, emerging research has begun to illuminate a striking connection between the gut microbiome and endometriosis - one that may eventually reshape how the condition is diagnosed, understood, and managed.
The Gut Microbiome in Endometriosis: What the Research Shows
Your gut is home to trillions of micro-organisms - bacteria, fungi, viruses - that collectively form the gut microbiome. In recent years, researchers have identified a consistent pattern: women with endometriosis show distinctly different gut microbiome profiles compared to those without the condition.
A landmark 2024 cohort study of 1,000 individuals by Pérez-Prieto et al., published in BMC Medicine, confirmed distinct gut microbiome signatures in endometriosis patients. A 2025 analysis by Wang et al. found that the ratio of Firmicutes to Bacteroidetes — two major bacterial phyla — is elevated in endometriosis patients, indicating a state of gut dysbiosis (imbalance). Earlier work by Huang et al. (2021) identified specific bacterial genera, including Ruminococcus, as having high diagnostic value as potential biomarkers for the condition.
A 2025 review in Frontiers in Cellular and Infection
Microbiology found that abnormal Fusobacterium and Gram-negative bacteria influence the immune microenvironment of ectopic lesions through lipopolysaccharides (LPS), contributing to chronic inflammation and disease progression.
The Estrobolome: Your Gut's Role in Oestrogen Regulation
Endometriosis is an oestrogen-dependent condition — it grows and thrives in the presence of oestrogen. What many people do not realise is that a subset of gut bacteria, known collectively as the estrobolome, plays a central role in regulating how oestrogen is metabolised and either excreted or recirculated in the body.
When the gut microbiome is disrupted, the estrobolome is disrupted with it. This can lead to elevated circulating oestrogen levels - precisely the hormonal environment that fuels endometriotic lesion growth. Supporting the health and diversity of the gut microbiome is therefore not simply a digestive concern; it is directly relevant to the hormonal drivers of endometriosis itself.
The Gut-Brain Axis, Pain, and Mood
Many women with endometriosis also experience anxiety, depression, and heightened pain sensitivity - symptoms that can sometimes be attributed to "stress" or dismissed as secondary concerns. Research is beginning to explain why these co-occurrences are not coincidental.
A 2024 study by Hearn-Yeates et al., Reproduction & Fertility found that the gut-brain axis plays a key role in endometriosis — gut bacteria communicate with the brain via the vagus nerve, influencing inflammatory pathways and pain signalling. This bidirectional communication may help explain the mood disorders and chronic pain sensitisation that so often accompany the condition.
Short-Chain Fatty Acids and Inflammation
Beneficial gut bacteria produce short-chain fatty acids (SCFAs) — compounds such as butyrate, propionate, and acetate — which have well-documented anti-inflammatory and gut-protective effects. In the context of endometriosis, SCFAs appear to have protective effects against endometriotic lesion formation. A depleted SCFA-producing community in the gut therefore removes one of the body's own natural anti-inflammatory defences.
The Promise of the Microbiome as a Diagnostic Tool
One of the most hopeful implications of this research is the potential to use gut microbiome profiles as a non-invasive biomarker for earlier diagnosis. Currently, definitive diagnosis typically requires laparoscopic surgery - an invasive procedure that contributes to those devastating 9+ year delays. A reliable, non-invasive diagnostic tool based on microbiome signatures could transform the diagnostic pathway and potentially bring us significantly closer to that one-year diagnosis goal.
The science connecting the gut microbiome to endometriosis is still emerging, but the direction is clear: dysbiosis, oestrogen regulation, and chronic inflammation are meaningfully linked, and the gut is a legitimate focus for therapeutic support. Nutritional therapy has a real and evidence-informed role to play as part of an integrated management plan - not as a replacement for medical care, but as a layer of support that is too often missing. In my next post, I will share practical, evidence-informed steps you can take right now to begin supporting your gut health in the context of endometriosis.
Disclaimer: Nutritional therapy is a complementary approach and is not a replacement for medical diagnosis, treatment, or the care of your GP, gynaecologist, or other healthcare professionals. If you are experiencing symptoms of endometriosis, please seek medical advice. The information in this article is intended for educational purposes only and does not constitute medical advice.
Sources and further reading:
Endometriosis UK. The State of Endometriosis Care in the UK: A Roadmap for Driving Down Diagnosis Times and Improving Access to Care. Endometriosis UK; February 2026. Available at: https://www.endometriosis-uk.org/sites/default/files/2026-02/Endometriosis - The State of Endometriosis Care Report.pdf
Barnett E. [Title unconfirmed — paywalled during verification]. The Independent. 1 June 2026. Available at: https://www.the-independent.com/health-and-wellbeing/emma-barnett-endimetriosis-pain-symptoms-documentary-b2985920.html
Barnett E. We can't ignore endometriosis, a disease that leaves women like me in agony. BBC News. 1 June 2026. Available at: https://www.bbc.com/news/articles/c4g4jpzxk4zo (Note: confirmed date is 1 June 2026, not 31 May as originally listed)
Emma Barnett: Fighting Endometriosis [television documentary]. BBC Two / BBC iPlayer. First broadcast 1 June 2026. Available at: https://www.bbc.co.uk/iplayer/episodes/m002x8nb/emma-barnett-fighting-endometriosis
Pérez-Prieto I, Vargas E, Salas-Espejo E, Lüll K, Canha-Gouveia A, Antequera Pérez L, et al. Gut microbiome in endometriosis: a cohort study on 1000 individuals. BMC Medicine. 2024;22:294. doi:10.1186/s12916-024-03503-y
Wang M, Wang J. [Full title and journal unconfirmed — appears only as secondary citation in other reviews; please supply original source if available]. 2025.
Hearn-Yeates F, Horne AW, O'Mahony SM, Saunders PTK. The impact of the microbiota–gut–brain axis on endometriosis-associated symptoms: mechanisms and opportunities for personalised management strategies. Reproduction & Fertility. 2024;5:e230085. doi:10.1530/RAF-23-0085
Huang L, Liu B, Liu Z, Feng W, Liu M, Wang Y, et al. Gut microbiota exceeds cervical microbiota for early diagnosis of endometriosis. Frontiers in Cellular and Infection Microbiology. 2021;11:788836. doi:10.3389/fcimb.2021.788836
Zheng Q, Sun T, Li X, Zhu L. Reproductive tract microbiome dysbiosis associated with gynecological diseases. Frontiers in Cellular and Infection Microbiology. 2025;15:1519690. doi:10.3389/fcimb.2025.1519690