Bowel & Bladder Endometriosis: Why It's Missed | Hormone Health with Marie

The Endometriosis Symptom Nobody Warns You About: When It's Not "Just IBS"

Most conversations about endometriosis centre on pelvic pain, heavy periods, and fertility. Those are real and they matter. But there's an aspect of this condition that gets almost no airtime, even though it affects a significant number of women living with it: bowel and bladder involvement.

In my clinic, this is one of the patterns I see most often go unnamed. Women come to me having been told, separately, that their bloating is "just IBS" and their bladder is "just sensitive" — while also living with painful, heavy, or irregular periods — and nobody has ever asked whether the two are connected.

Endometriosis Doesn't Stay in One Place

Endometriosis is tissue similar to the uterine lining growing outside the uterus. While it's often pictured as confined to the pelvis, it can implant on the bowel, the bladder, the ureters, and — less commonly — the diaphragm. Deep infiltrating endometriosis, in particular, has a well-documented tendency to involve the bowel or bladder wall.

Yet when women describe symptoms like:

- Pain or straining with bowel movements, especially around their period

- Bloating so severe it's been mistaken for pregnancy ("endo belly")

- Rectal bleeding that coincides with menstruation

- Urinary urgency, frequency, or pain that isn't a UTI

- Blood in urine around their cycle

…the pattern often gets missed. Each symptom gets referred to a different specialist — gastroenterology for the bowel symptoms, urology for the bladder ones — and nobody connects the dots back to the pelvis, because nobody's asking about the menstrual cycle timing.

This isn't a rare coincidence. Women with endometriosis are around three times more likely to also have an IBS diagnosis than women without it, and studies estimate that IBS symptoms show up in anywhere from around a tenth to over half of women with endometriosis, depending on how the studies are designed.[^1][^2] Bladder conditions like interstitial cystitis/bladder pain syndrome show a similar overlap.[^3]

Why This Gets Overlooked

A few reasons this stays under the radar:

It doesn't fit the "textbook" picture. Endometriosis awareness campaigns have (rightly) worked hard to get period pain taken seriously. But that focus means bowel and bladder symptoms don't get mentioned nearly as often, so women don't think to report them as connected — and clinicians outside gynaecology aren't necessarily trained to ask.

IBS is a much more common diagnosis. Statistically, most people with bowel symptoms don't have endometriosis. So bowel-focused endometriosis symptoms get folded into an IBS diagnosis, sometimes for years, before anyone asks whether the symptoms are cyclical.

The overlap is genuinely confusing. Endometriosis can also directly irritate nearby bowel and bladder tissue without infiltrating it, causing IBS-like symptoms through inflammation and nerve sensitisation rather than direct tissue growth.[^1] That means "cyclical IBS symptoms" don't automatically mean bowel endometriosis — but they're a signal worth investigating rather than dismissing.

It's an uncomfortable conversation. Rectal pain, bowel urgency, and bladder symptoms are harder to talk about than "period pain," even with a doctor. Many women quietly manage these symptoms alone for years before mentioning them to anyone.

The Pattern Worth Paying Attention To

The single most useful question to ask yourself is: does it track with my cycle?

Bowel or bladder symptoms that consistently worsen in the days before or during your period — even if they're present at other times too — are worth raising specifically as a possible endometriosis pattern, not just "IBS" or "a sensitive bladder." Keeping a simple symptom and cycle diary for two to three months can make this pattern visible in a way that's hard to dismiss, and gives your GP or specialist something concrete to work from.

It's also worth knowing that bowel and bladder involvement is one of the reasons diagnosis takes so long. The average time from first symptoms to an endometriosis diagnosis in the UK now stands at 9 years and 4 months — and it's risen, not fallen, in recent years.[^4] If your gynaecological symptoms are being investigated but bowel or bladder symptoms are still being treated as unrelated, it's entirely reasonable to ask directly whether they could be part of the same picture.

## Where Herbal and Nutritional Support Fits

This isn't a symptom pattern to self-manage without proper investigation — deep infiltrating endometriosis affecting the bowel or ureters can have serious long-term implications if left unaddressed, and it needs proper clinical assessment, which may include imaging or specialist referral.

Where herbal medicine has a role is alongside that process: supporting the inflammatory and hormonal drivers that contribute to symptom severity, and supporting gut and pelvic tissue resilience while you're being investigated or treated. In clinic, this always starts with listening to the full picture — your cycle, your bowel and bladder history, and everything in between — rather than treating symptoms in isolation. That's a conversation I'd rather have with you directly than try to generalise here, because everyone's presentation is genuinely different.

The Bottom Line

If you live with endometriosis and have bowel or bladder symptoms you've been managing quietly, or been told are "unrelated" — you're not imagining the connection, and you're not alone in not knowing it existed. This is a genuinely underdiscussed corner of a condition that already takes far too long to diagnose. The more this gets talked about, the sooner these patterns get recognised, investigated, and taken seriously.

If any of this sounds familiar and you'd like to talk it through properly, I'd love to help you make sense of your own pattern. You can [book a consultation here](https://link.feacreate.com/widget/booking/pKKYkTGLEGotXXoMEMex) — there's no pressure, just a proper conversation about what's actually going on for you.

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### References

[^1]: Chiaffarino, F. et al. (2021). Endometriosis and irritable bowel syndrome: a systematic review and meta-analysis. Archives of Gynecology and Obstetrics. Available at: https://pubmed.ncbi.nlm.nih.gov/32949284/

[^2]: Seaman, H. et al. Endometriosis and irritable bowel syndrome: A systematic review and meta-analyses. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC9357916/

[^3]: Prevalence and Clinical Correlates of Endometriosis in Patients with IC/BPS. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC11753943/

[^4]: Endometriosis UK (2026). New report highlighting alarming increase in endometriosis diagnosis times. Available at: https://www.endometriosis-uk.org/endometriosis-uk-release-new-report-highlighting-alarming-increase-endometriosis-diagnosis-times