Endometriosis: What her partner needs to know

If the woman in your life has endometriosis, or if she's been in pain for years without anyone telling her why, this guide is for you. Not a clinical summary — there are plenty of those aimed at patients. This is a plain-language account of what the condition is, what living with it actually looks like day to day, and what the evidence — including research specifically on partners — tells us about what helps and what doesn't.

Understanding endometriosis will not cure it. But the research is consistent on one point: partners who understand the condition are a meaningful source of support. And partners who don't understand it can, unintentionally, make things worse.

What is endometriosis?

Endometriosis is a chronic inflammatory disease in which tissue similar to the lining of the uterus grows in places it shouldn't — most commonly on the ovaries, fallopian tubes, and the tissue lining the pelvis, but sometimes elsewhere in the body including the bowel, bladder, and in rare cases more distant sites.¹

This tissue responds to hormonal changes the same way the uterine lining does — thickening and breaking down across the cycle. But unlike menstrual tissue inside the uterus, it has nowhere to go. The result is inflammation, the formation of scar tissue, and in many cases adhesions — where organs can become fused together. This process is what causes the pain.

What causes it?

The honest answer is that the cause of endometriosis is not fully understood. The most widely accepted explanation involves retrograde menstruation — where menstrual blood flows backward through the fallopian tubes into the pelvic cavity, carrying endometrial cells with it. But this explanation is incomplete: retrograde menstruation occurs in an estimated 90% of women, while only around 10% develop endometriosis. That gap points to additional factors.⁵

Current research increasingly points to immune dysfunction as the permissive factor — in women with endometriosis, the immune system appears to fail to clear misplaced endometrial tissue, allowing it to implant, survive, and grow. Genetic predisposition, hormonal influences, and environmental exposures are also implicated. The condition is likely multifactorial, meaning no single cause explains every case.⁶

What this means practically: endometriosis is not caused by anything she did or didn't do. It is not stress, diet, lifestyle, or attitude. Framing it in those terms — however well-intentioned — is inaccurate and unhelpful.

What endometriosis actually feels like

Endometriosis presents differently in every person who has it, and there is a well-documented mismatch between the severity of disease visible on a scan or in surgery and the severity of symptoms experienced. Some women with extensive endometriosis have mild symptoms. Others with minimal visible disease are in significant pain. Symptom severity is not a measure of effort, tolerance, or seriousness.¹

Common symptoms include:

• Chronic pelvic pain — not just during periods, but throughout the month, varying in intensity
• Severe period pain (dysmenorrhoea) — pain that is disproportionate to what most women experience, often requiring strong painkillers or time off work
• Pain during or after sex (dyspareunia) — reported by 32–70% of women with endometriosis, depending on the location of lesions⁷
• Fatigue — frequently severe and not relieved by rest, linked to the chronic inflammatory process
• Painful bowel movements or urination, particularly around menstruation
• Bloating — sometimes significant, often referred to by women with endometriosis as "endo belly"
• Reduced fertility — endometriosis is found in 30–50% of women experiencing infertility²
• Depression and anxiety — reported at higher rates in women with endometriosis, linked to chronic pain, diagnostic delay, and the ongoing uncertainty of the condition⁸

The diagnosis problem

The average time from first presenting to a GP with symptoms to receiving an endometriosis diagnosis in the UK is now almost nine years — and it is getting worse, not better. A 2024 Endometriosis UK survey of over 4,000 diagnosed women found the average had increased to 8 years and 10 months, up from 8 years in 2020. A further 2026 survey of over 3,000 respondents found the average has now surpassed nine years.⁹

The gold standard for diagnosing endometriosis is laparoscopy — surgical investigation under general anaesthetic. You cannot diagnose it with a blood test. A normal ultrasound does not rule it out. This means that for years, women presenting with severe pain are frequently told nothing is wrong because nothing shows up on the tests that are quick and easy to run.

Around one in four respondents in the 2026 survey reported needing to visit their GP ten or more times before endometriosis was even suspected. More than half had attended A&E with symptoms; 46% of those were sent home without treatment.⁹

By the time a woman receives a diagnosis, she will often have spent nearly a decade being disbelieved, misdiagnosed, and undertreated. That history shapes how she talks about her condition, how much she expects from healthcare, and how much she trusts that things can get better. Understanding this context — not just the biology — is part of understanding her.

The impact on partners — what the research says

A landmark qualitative study funded by the Economic and Social Research Council, which interviewed male partners of women with endometriosis alongside the women themselves, found that endometriosis affected men across multiple domains of their lives — including sex and intimacy, plans for children, working life and household income, and their own emotional wellbeing.¹⁰

Men in that study described emotional responses including helplessness, frustration, worry, and anger — and noted the near-total absence of professional recognition that they were affected at all. The researchers concluded that male partners have a marginalised status in endometriosis care: present in the relationship, invisible in the system.

A 2022 cross-sectional study of 104 couples found high interdependence between partners in measures of psychological distress and sexual satisfaction — meaning that when she was struggling, he was too, and vice versa. The researchers noted that male partners should be explicitly included in endometriosis counselling and treatment, which currently they almost never are.¹¹

A 2026 qualitative study of ten couples, published in the journal Sexual and Relationship Therapy, found that endometriosis affected intimacy, fertility, social life, and professional identity for both partners — often straining relationships, but in some cases also building resilience through communication and shared adaptation. The overarching theme the researchers identified was uncertainty, endurance, and the need for both partners to find ways to hold on.¹²

Sex, intimacy, and what the data shows

This is the area where partners most commonly report struggling — and where misunderstanding does the most damage to relationships.

Dyspareunia (pain during or after sex) affects 32–70% of women with endometriosis, depending on the location and extent of disease.⁷ In the ESRC qualitative study, nearly half of couples reported that sex was non-existent or rare, either currently or during a recent period. Others reported significantly reduced frequency. The reasons were not limited to physical pain alone — general fatigue, low mood, side effects of hormonal medication, bleeding during or after sex, and the accumulated weight of having a body that regularly causes pain all contributed.¹⁰

A 2024 qualitative study of 22 couples, published in Sexual and Relationship Therapy, found that endometriosis impacts on sex extended well beyond dyspareunia — affecting emotional closeness, spontaneity, and the sense of the relationship itself. Men in the study described navigating a tension between their own needs and their desire not to cause her pain, without clear guidance on how to do so.¹³

What this asks of a partner is significant and often goes unacknowledged. Adapting to a changed sexual relationship — long-term, without knowing if or when things might change — is a real and sustained demand. The couples who navigated it best tended to have found ways to talk about it directly, to prioritise intimacy and connection beyond sex specifically, and to avoid sex becoming a source of pressure for either of them.

Adenomyosis — the condition that often comes with it

Adenomyosis is a related but distinct condition in which endometrial-like tissue grows into the muscular wall of the uterus itself rather than outside it. It causes the uterus to enlarge and become tender, and produces symptoms that overlap substantially with endometriosis: severe period pain, heavy bleeding, chronic pelvic pain, and fatigue.

The two conditions frequently co-occur. Research published in 2024 found co-occurrence rates approaching 90% in some populations, though this figure varies significantly across studies depending on how each condition is defined and detected.¹⁴ What this means practically is that if she has endometriosis, adenomyosis may also be present — and may not have been separately diagnosed, because diagnosing adenomyosis definitively has historically required a hysterectomy. Improved ultrasound and MRI protocols are changing that, but it remains underdiagnosed.

The relevance for partners is straightforward: if her symptoms seem more severe or more constant than a description of endometriosis alone would suggest, adenomyosis may be part of the picture. It isn't a separate problem to investigate independently — it's worth raising with her gynaecologist if it hasn't already been discussed.

Treatment — what it involves and what it means for you

There is no cure for endometriosis. All current treatments aim to manage symptoms, reduce disease progression, or address fertility. Understanding what she may be going through in treatment is part of understanding the condition.

The main treatment routes are:

• Pain relief — NSAIDs like ibuprofen are a common first line for period pain. They help some women significantly; for others with severe disease, they make little difference. If she's taking strong painkillers regularly, that's a measure of how much pain she's in — not a lifestyle choice.
• Hormonal suppression — the most common medical approach. Combined oral contraceptives, progestins (including the Mirena coil and tablets like dienogest), and GnRH agonists or antagonists all work by suppressing ovarian function and reducing or eliminating menstruation. This can provide significant pain relief but comes with side effects. GnRH agonists in particular can induce a medically menopausal state — hot flushes, mood changes, joint pain, and reduced libido are all reported. A 2025 survey found that GnRH agonists worsened fatigue in more than half of users.¹⁵ If she seems different on treatment — emotionally, physically, in terms of energy or desire — the medication is likely a factor.
• Surgery — laparoscopy to excise or ablate endometriosis lesions. This is the only way to confirm diagnosis and the only treatment that addresses disease directly rather than suppressing it. It can provide substantial relief, but recurrence is common: symptoms return in up to 50% of women within five years of surgery.¹⁶ Some women require multiple procedures across their lives. Surgical recovery typically takes two to six weeks depending on the extent of disease removed, during which she will need practical support.

Fertility — the conversation that often goes unspoken

Endometriosis is found in 30–50% of women experiencing infertility, making it one of the leading causes.² The mechanisms are multiple: inflammation in the pelvic cavity can impair egg quality and implantation; lesions on the fallopian tubes can cause blockages; adhesions can alter the anatomy of the reproductive system. The extent to which endometriosis affects any individual woman's fertility varies significantly and cannot be predicted from symptom severity alone.

For couples where children are wanted — now or in the future — this creates a layer of anxiety that sits underneath the relationship even when it isn't being discussed. A 2024 study of 62 women with endometriosis and their partners found that dyadic effects on relationship and sexual satisfaction were strongest in couples where infertility was also present — meaning that the combined weight of both conditions created stress that moved through the couple, not just the individual.¹⁷

If fertility is a concern, the treatment path is separate from pain management and should ideally involve a specialist in reproductive medicine alongside a gynaecologist who understands endometriosis. IVF is an option, but it is not always necessary and the evidence on whether surgical treatment of endometriosis improves IVF outcomes is mixed — decisions about sequencing are best made with a clinician who knows her specific situation.

What a partner can do in this space is limited but not trivial. Not adding pressure around timelines. Not making fertility the dominant subject of conversations about her health. Being willing to talk about it directly when she wants to, and not requiring her to manage your anxiety about it on top of her own. A 2023 qualitative study of women's lived experience of endometriosis-related fertility found that the emotional burden of the uncertainty was often as significant as the physical one — and that the support of a partner who could hold that uncertainty without collapsing into it made a meaningful difference.¹⁸

What she needs from you — and what she doesn't

There is no universal answer here. Endometriosis is highly individual — two women with the same diagnosis can have radically different experiences of it. What follows is grounded in what the research and the experience of endometriosis communities consistently identifies. But the most important thing is to ask her what she actually needs, and to accept that her answer will change over time and across the cycle.

She needs to be believed. Not believed in a conditional sense — "I believe you're in pain, but maybe you should try…" — but genuinely believed that she knows her body, that her pain is real, and that her experience of the medical system has been as difficult as she says it has. Many women with endometriosis have been disbelieved for so long by so many people — including doctors — that being believed by the person closest to them carries an outsized weight.

She needs you to understand that symptoms vary across the cycle. Endometriosis pain is often worst around menstruation but can be present at any point. Good days are not evidence that it wasn't as bad as she said. Bad days are not predictable or controllable. Understanding the cyclical nature of the condition — without using it to predict or pre-empt her experience — helps you respond to where she actually is rather than where you expect her to be.

She needs low-friction presence, not solutions. The research on endometriosis partners consistently finds that men default toward problem-solving — researching treatments, suggesting dietary changes, investigating surgical options. Sometimes this is welcome. Often, during a hard stretch, what is needed is simply a reduced load and a calm presence. Arriving with a protocol is its own kind of pressure. Ask before you advise.

She does not need her pain minimised. Comparisons to others who "manage fine", suggestions that positive thinking helps, or observations that the pain seems inconsistent are all forms of minimisation — even when they come from a place of care. The evidence on chronic pain is clear: social support that involves belief and validation improves outcomes; minimisation makes them worse.

Looking after yourself

The research on male partners of women with endometriosis uses consistent language: isolation, helplessness, lack of support, marginalised status. These are not minor inconveniences — they are the documented experience of people in a sustained caregiving role with no infrastructure around them.

You are not required to absorb an unlimited amount without support of your own. Having people you can speak to honestly, or working with a therapist individually or as a couple, is not a failure of commitment. It is what makes the long-term sustainable rather than a slow erosion.

Couples therapy with someone who understands chronic illness — and ideally endometriosis specifically — can be particularly valuable. Not because the relationship is in trouble, but because having a dedicated space to talk about the impact of a chronic condition on both of you tends to surface things that otherwise stay unspoken until they become problems.

Endometriosis and Yori

Yori supports endometriosis as one of its six dedicated conditions. When a profile is set up with endometriosis, the daily AI insights adapt to reflect the specific dynamics of the condition — including the chronic pain dimension, the cycle-linked variation in symptoms, and the kind of presence that tends to help on different days.

Yori does not tell you what she is feeling. It gives you grounding in what may be happening at each point in her cycle — so that you are not navigating the harder days entirely without context.