Endometriosis and Fertility: The Questions Dublin Women Actually Ask

What is endometriosis, and how common is it really?

Endometriosis occurs when tissue similar to the lining of the uterus grows in other places in the body, most often the ovaries, fallopian tubes, and the peritoneum lining the pelvis, but occasionally further afield, including the bladder or bowel. Because this tissue behaves similarly to the uterine lining, it responds to the hormonal cycle, which means it can bleed, inflame the surrounding tissue, and over time contribute to scarring and adhesions.

It is far more common than most people realise. The HSE describes it as affecting up to 1 in 7 women and girls in Ireland, typically beginning around the time periods start and persisting until menopause. Severity varies enormously: some women have minimal symptoms, and some have disease significant enough to affect daily life, work and relationships. At EC Clinic in Dublin, assessment often begins with a consulta ginecológica general o una consulta de salud reproductiva, depending on your goals.

What are the different types of endometriosis, and does the type matter for fertility?

Endometriosis is not one uniform disease, and this is exactly where the fertility conversation gets more useful than a single diagnosis label. Clinically, it is generally grouped into three patterns.

Superficial peritoneal endometriosis involves implants on the surface lining of the pelvis. It is often the least anatomically disruptive form, though it can still cause significant pain. Ovarian endometriosis, or an endometrioma, involves a cyst within the ovary — sometimes referred to as a “chocolate cyst” because of the appearance of the old blood it contains — and this form can affect ovarian tissue and, in some cases, ovarian reserve. Deep infiltrating endometriosis involves tissue growing into deeper structures such as the bowel, bladder or the ligaments supporting the uterus, and is generally the most anatomically complex to treat.

For fertility specifically, what tends to matter most is not simply which category applies, but how much disease is present, whether the fallopian tubes and ovaries are structurally affected, and whether an endometrioma is present and how large it is. Two women with “ovarian endometriosis” on paper can have very different fertility pictures depending on the size of the cyst and whether ovarian reserve has been affected.

Does endometriosis actually cause infertility?

Not in every case, and this is worth saying clearly because the internet tends to compress this into a much more frightening statement than the evidence supports. Many women with endometriosis conceive naturally, including some with confirmed disease found incidentally during unrelated surgery.

Where endometriosis can affect fertility, several mechanisms are understood to contribute: inflammation within the pelvis can affect egg quality and the way the fallopian tubes and ovaries interact; scarring and adhesions can distort pelvic anatomy in a way that makes it harder for an egg to travel from ovary to tube; and, in the case of endometriomas, the cyst itself, or its surgical removal, can reduce the number of eggs remaining in the affected ovary.

The honest, useful framing is this: endometriosis is a risk factor for fertility difficulty, not a guaranteed cause of it. Severity, location, age, and how long a couple has been trying all shape the individual picture far more than the diagnosis alone.

How is endometriosis actually diagnosed?

The pathway usually starts with your GP taking a detailed symptom history and performing an abdominal and vaginal examination, since symptoms can overlap with other conditions. Because endometriosis can often be managed with medication in the first instance, your GP may suggest a trial of treatment before further testing — if that controls your symptoms well, additional investigation may not be necessary straight away.

If symptoms persist despite treatment, referral to a gynaecologist follows, and further tests can include a pelvic ultrasound to look for structural signs such as an endometrioma — at EC Clinic this may sit alongside pathways such as a fertility scan for IVF when imaging is clinically indicated. The only way to confirm endometriosis with certainty, however, is laparoscopy: a surgical procedure in which a thin tube is passed through a small incision in the abdomen to directly visualise the pelvis and, where appropriate, take a biopsy or treat visible disease at the same time.

How does day-to-day life actually feel with endometriosis?

Symptoms vary widely between women, but the most commonly reported include lower abdominal or back pain that can occur before, during or throughout the cycle; period pain severe enough not to respond to standard pain relief; heavy menstrual bleeding; pain during sex; pain with bowel movements or urination that worsens around your period; and persistent fatigue. Some women also notice nausea, constipation or diarrhoea around their period.

It is entirely possible to have significant disease with few symptoms, and equally possible to have very disruptive symptoms with relatively limited disease on imaging. This mismatch is part of why the condition is so often under-recognised, and why the pattern and persistence of symptoms — not their severity alone — is what should prompt assessment.

Should I take fertility supplements if I have endometriosis?

Only after testing for what you actually need, rather than taking a broad stack of supplements on the assumption that more must be better. Nutritional deficiencies — vitamin D in particular, along with iron, B12 and folate — are associated with poorer fertility outcomes generally, and much of Ireland runs low in vitamin D, especially through autumn and winter.

The more useful sequence is: test first, correct what is genuinely low, and reassess as your fertility plan evolves, whether that is trying naturally, considering IUI, or moving toward IVF. Guided supplementation, based on your actual results, supports fertility far more reliably than guesswork.

I’ve been told my endometriosis is “mild” — does that mean my fertility definitely isn’t affected?

Not necessarily, and this is one of the more counterintuitive parts of the condition. The amount of visible disease seen at laparoscopy does not always correlate neatly with how much pain a woman experiences or how her fertility is affected. Some women with extensive disease conceive without difficulty; some women with limited visible disease have a harder time. Inflammation, subtle effects on egg quality, and how the fallopian tubes and ovaries are interacting can all matter more than the visible extent of disease alone.

This is exactly why a fertility conversation for a woman with endometriosis should never stop at the word “mild” or “severe” on a surgical report. It should include your age, how long you’ve been trying, your ovarian reserve if that’s relevant to your timeline, and your specific symptoms, because those factors, taken together, give a far more useful picture than the grade of disease by itself.

Does endometriosis affect ovarian reserve, and should I have that checked?

It can, particularly when an endometrioma is present in the ovary — both the cyst itself and, in some cases, its surgical removal can reduce the number of eggs remaining in that ovary. This doesn’t mean every woman with endometriosis needs ovarian reserve testing, but it is a reasonable and common part of the fertility conversation when endometriomas are involved, family-building is a near-term priority, or a woman is approaching a decision about surgery.

Ovarian reserve markers such as AMH (anti-Müllerian hormone) and antral follicle count on ultrasound give an estimate of egg quantity, not egg quality, and they are most useful when they answer a specific question — for example, helping plan the timing of treatment or informing a decision about whether to operate on an endometrioma before or after attempting pregnancy. They are not, by themselves, a verdict on whether you can or cannot conceive. For more on that distinction, see our post on ovarian age, ovarian reserve and egg quality.

What does treatment and support actually look like?

There is no single endometriosis protocol, because the right plan depends on your type, severity, symptoms, age and whether you are actively trying to conceive. Options broadly include medical management to control symptoms and slow disease activity; surgical management to remove or treat visible disease, which can improve both pain and, in some cases, fertility; and, where fertility is the priority and natural conception has not occurred, assisted options such as IUI or IVF.

Where an endometrioma is present and fertility is a priority, the decision to operate is not automatic. Surgery can improve the anatomical picture, but it can also further reduce ovarian reserve in some cases, so this is a genuinely individualised decision made together with your gynaecologist, weighing the size and behaviour of the cyst against your age and fertility timeline.

Medically reviewed by Dr. Eliana Castañeda, Obstetrician-Gynaecologist and Aesthetic Specialist · 9 October 2026

— Dra. Eliana Castañeda
Obstetrician-Gynaecologist and Aesthetic Specialist · Medical Director, EC Clinic Dublin · 22+ years of clinical practice across Venezuela, Spain and Ireland