The Hidden Link Between Endometriosis and IBS

What Is Endometriosis?

Endometriosis is a chronic disease in which tissue similar to the lining of the uterus grows outside the uterus, triggering inflammation and the formation of scar tissue (5). It's far from rare — an estimated 10% of women of reproductive age worldwide, around 190 million people, live with the condition, with symptoms that can begin as early as a person's first period and persist through menopause (5). Common symptoms include severe pain during menstruation, heavy menstrual bleeding, chronic pelvic pain that doesn't resolve when a period ends, infertility, and abdominal bloating and nausea (5). It can also affect bowel movements, urination, sexual intercourse, and mental health, and while there's currently no cure, treatment can help control symptoms and limit long-term impact (5). Diagnosis is often slow — commonly taking between four and twelve years — partly because symptoms vary so widely from person to person and overlap heavily with other conditions (5).

That last point is exactly where irritable bowel syndrome (IBS) comes in.

If you've been told you have IBS but the usual advice hasn't fixed things, you're not alone — and you might not have the full picture. A growing body of research shows that for a significant number of women, digestive symptoms attributed to IBS are actually being driven, at least in part, by endometriosis. Understanding this overlap matters, because it changes how symptoms should be managed — and it also clarifies what a gut-support supplement like JUVIA™ can realistically be expected to do, and what it can't.

Two Common Conditions, One Confusing Overlap

IBS affects somewhere between 5–10% of the population, while endometriosis affects roughly 1 in 10 women of reproductive age (3). Both conditions cause abdominal pain, bloating, and changes in bowel habits — which is precisely the problem. Up to 90% of endometriosis patients report symptoms that a gastroenterologist would also recognise in IBS, and the two conditions are thought to coexist in as many as 60% of cases (2).

A 2022 systematic review and meta-analysis pooling data from over 96,000 women put a number on this relationship: women with endometriosis have roughly three times the odds of also having IBS compared with women without endometriosis (1). Across the studies reviewed, IBS prevalence among women with confirmed endometriosis ranged from about 10% to 52%, with a pooled estimate of just over 23% (1). In other words, close to one in four women with endometriosis is also living with IBS — and for many, the endometriosis is what's actually driving the gut symptoms, not a separate, unrelated issue.

Why the Symptoms Overlap

The overlap isn't a coincidence of two unrelated diseases happening to share symptoms — there's likely a real physiological connection. Researchers have proposed several mechanisms:

• Immune and inflammatory pathways. Both conditions have been linked to increased activation of mast cells — immune cells that, when activated near the bowel or pelvic nerves, can drive pain and altered bowel function (1).
• Retrograde menstruation. Menstrual blood containing endometrial cells may enter the pelvic cavity and trigger local inflammation that affects nearby bowel tissue (1).
• Hormonal signalling. Receptors for reproductive hormones exist not just in pelvic organs but in the enteric nervous system (the gut's own nervous system), which may explain why gastrointestinal symptoms in both endometriosis and IBS often flare around menstruation (1).
• Visceral hypersensitivity. Both conditions involve the gut and pelvic organs becoming more sensitive to normal sensations, amplifying pain signals (1, 3).

Endometriosis can also affect the bowel directly. Superficial or deep lesions can sit on or infiltrate the bowel wall, and symptoms — pain when opening the bowels, deep pelvic pain during sex, and occasionally rectal bleeding during a period — tend to track with the menstrual cycle rather than appearing randomly, which is one of the clues that distinguishes it from "textbook" IBS (4).

Why This Gets Missed

Diagnosing endometriosis is hard. The gold-standard test is laparoscopic surgery, and imaging can miss the disease even when it's present (3). On average, women in the UK wait around eight years for a diagnosis, often after seeing multiple GPs and specialists first (3). Because the symptoms look so much like IBS, many women are diagnosed with — and treated for — IBS for years before endometriosis is ever considered (2, 3).

What Actually Helps: Diet and Lifestyle

For IBS symptoms generally — whether or not endometriosis is also present — dietary approaches have the best evidence behind them. The low FODMAP diet, which temporarily reduces fermentable carbohydrates that are poorly absorbed in the small intestine, improves symptoms in an estimated 52–86% of people with IBS (3). Interestingly, one retrospective study found that women with concurrent endometriosis who tried a low FODMAP diet saw an even higher rate of improvement (72%) than those without endometriosis (49%) (3).

For endometriosis specifically, a Mediterranean-style eating pattern — rich in antioxidants, oily fish, olive oil, and vegetables — has shown promise for reducing general pain and period pain, although the evidence base is still developing and no single diet is currently recommended across the board (3). Basic lifestyle measures also matter: eating regularly, staying hydrated, moderating caffeine and alcohol, and managing stress all support gut function regardless of the underlying cause (3).

Where a Gut-Support Supplement Like JUVIA™ Can Realistically Fit

This is where it's worth being precise about what a product like JUVIA™ is, and isn't, for.

JUVIA™ is a digestive supplement built around ERME™ (Enzyme Rich Malt Extract), a barley-derived ingredient containing a range of naturally occurring digestive enzymes. According to the manufacturer, it's intended to support the breakdown of food before it reaches the lower gut, with the aim of easing everyday digestive discomfort such as bloating, irregularity, and general digestive urgency.

For someone managing general IBS-type symptoms — the kind that show up regardless of an underlying gynecological cause — a product like this sits in the same broad category as dietary strategies: something aimed at reducing day-to-day digestive discomfort by supporting how food is broken down, rather than treating an underlying disease. Used alongside sensible habits like regular meals, adequate fluids, and moderated intake of common trigger foods, an enzyme-based supplement may be a reasonable addition for some people looking to ease bloating or irregularity.

What it isn't is a treatment for endometriosis, and it shouldn't be mistaken for one. Endometriosis is a structural, inflammatory, hormone-driven condition — the research above points to surgical and hormonal treatment as the established options, with diet as a supportive, not curative, measure (3, 4). Nothing about enzyme supplementation addresses ectopic endometrial tissue, the inflammation it causes, or the hormonal mechanisms thought to drive the gut symptoms of endometriosis. If period-linked bowel symptoms, pelvic pain, or pain during sex are part of the picture, that's a conversation to have with a doctor about endometriosis specifically — not something to try to manage through digestive support alone.

The Bottom Line

If you have digestive symptoms that have been labelled IBS but don't quite behave the way IBS is "supposed to" — worsening around your period, accompanied by pelvic pain, or not responding to standard IBS management — it's worth asking your doctor directly about endometriosis. The research is increasingly clear that this overlap is common, under-recognised, and worth investigating rather than assuming.

Once endometriosis has been ruled in or out, general digestive support — whether through dietary changes like low FODMAP, lifestyle habits, or a supplement like JUVIA™ aimed at easing everyday bloating and irregularity — can be a sensible part of managing the digestive symptoms that remain. It's a complement to proper diagnosis and medical care, not a substitute for it.