Endometriosis and Fertility: What You Need to Know When Trying to Conceive

Endometriosis affects approximately 1 in 9 women in Australia of reproductive age — making it one of the most common yet most under-diagnosed conditions in women's health. For many, the diagnosis comes only after years of unexplained pain, heavy periods, or difficulty conceiving. If you've been diagnosed with endometriosis and are trying to get pregnant, understanding how the condition affects your fertility — and what you can do about it — is essential.

This comprehensive guide explores the relationship between endometriosis and fertility, covers the latest treatment options, and outlines practical steps you can take to support your reproductive health.

Understanding Endometriosis: What Is It?

Endometriosis is a chronic inflammatory condition in which tissue similar to the endometrium (the lining of the uterus) grows outside the uterus. These lesions most commonly appear on the ovaries, fallopian tubes, the peritoneum (the tissue lining the pelvic cavity), and the bowel. In rare cases, endometriosis can spread to distant sites including the lungs, diaphragm, or even the brain.

Unlike the uterine lining, which is shed during menstruation, endometrial lesions outside the uterus have no way to exit the body. This causes inflammation, scarring, and the formation of adhesions — fibrous bands that can cause organs to stick together. On the ovaries, endometriosis often forms cysts filled with dark, old blood called endometriomas (sometimes called "chocolate cysts").

Symptoms of Endometriosis

• Pelvic pain, particularly during menstruation (dysmenorrhoea)
• Pain during or after sexual intercourse (dyspareunia)
• Pain with bowel movements or urination, especially during periods
• Heavy or irregular periods
• Fatigue and bloating
• Difficulty conceiving

A critical and frustrating aspect of endometriosis is that symptom severity doesn't always reflect the extent of the disease. Some women with severe endometriosis have minimal pain; others with mild disease experience debilitating symptoms. Similarly, fertility impact doesn't always correlate with disease stage.

How Endometriosis Affects Fertility

Endometriosis is associated with reduced fertility, but the relationship is complex. Approximately 30–50% of women with endometriosis experience some degree of difficulty conceiving. The mechanisms by which endometriosis affects fertility include:

1. Structural Damage

Advanced endometriosis (Stages III and IV) can cause significant anatomical distortion. Fallopian tube blockages from adhesions prevent eggs from travelling from the ovary to the uterus. Ovarian endometriomas can damage the healthy ovarian tissue surrounding them, reducing ovarian reserve.

2. Inflammation and Toxic Environment

Endometriosis creates a pro-inflammatory environment in the pelvis. Research shows elevated levels of inflammatory cytokines, prostaglandins, and macrophages in the peritoneal fluid of women with endometriosis. This inflammatory environment can impair sperm function, oocyte quality, fertilisation, and early embryo development.

3. Reduced Ovarian Reserve

Women with endometriosis, particularly those with ovarian endometriomas, tend to have lower anti-Müllerian hormone (AMH) levels — a marker of ovarian reserve — compared to unaffected women of similar age. Each surgical removal of endometriomas also risks damaging healthy ovarian tissue, further reducing reserve.

4. Implantation Difficulties

Endometriosis may impair endometrial receptivity — the ability of the uterine lining to successfully accept and implant an embryo. Altered expression of genes involved in implantation has been found in the endometrium of women with endometriosis, even in minimal-mild disease.

5. Altered Sperm-Egg Interaction

The inflammatory peritoneal fluid associated with endometriosis can impair sperm motility and the ability of sperm to penetrate the zona pellucida (the outer layer of the egg). This is one reason why even mild endometriosis can reduce monthly fecundity rates below the average.

Endometriosis Staging and Its Fertility Implications

Endometriosis is classified into four stages by the American Society for Reproductive Medicine (ASRM) based on location, extent, and depth of lesions:

• Stage I (Minimal): Small, isolated lesions; no significant adhesions — fertility impact is mild but present
• Stage II (Mild): More lesions, shallow implants; minor adhesions — fertility mildly reduced
• Stage III (Moderate): Multiple deep implants, endometriomas on ovaries, dense adhesions — fertility significantly impacted
• Stage IV (Severe): Large endometriomas, extensive adhesions, possible fallopian tube occlusion — most significant fertility impairment

Importantly, even Stage I–II endometriosis is associated with reduced monthly fecundity rates (the probability of achieving a pregnancy in a given cycle). Untreated, women with minimal-mild endometriosis have estimated monthly fecundity rates of 2–10% compared to 15–20% in unaffected women.

Getting Pregnant With Endometriosis: Your Options

Expectant Management (Trying Naturally)

For women under 35 with mild endometriosis, good ovarian reserve, and no tubal obstruction, a period of expectant management (trying to conceive naturally) is often recommended — particularly if pain is manageable. Many women with endometriosis do conceive naturally, and treatment is not automatically necessary.

During expectant management, optimising the timing of intercourse through ovulation tracking (OPKs, cervical mucus monitoring) and supporting overall fertility through nutrition and supplementation is key.

Surgical Treatment

Laparoscopic surgery — the gold standard for diagnosing endometriosis — can also treat lesions, remove endometriomas, and free adhesions. For women trying to conceive:

• Surgery for Stages I–II endometriosis has been shown in randomised controlled trials to improve pregnancy rates compared to diagnostic laparoscopy alone (Marcoux et al., 1997)
• Endometrioma surgery is more controversial — it removes diseased tissue but can also reduce ovarian reserve; the decision should be individualised based on size, symptoms, and reproductive plans
• Repeated surgeries carry cumulative risk to ovarian reserve and are generally avoided if IVF is being planned

IUI (Intrauterine Insemination)

For mild endometriosis with patent tubes, IUI combined with ovarian stimulation offers improved pregnancy rates compared to expectant management. Success rates per cycle are typically 10–15% for women with mild endometriosis.

IVF (In Vitro Fertilisation)

For moderate-severe endometriosis, significant ovarian reserve concerns, or after failed IUI cycles, IVF is typically recommended. IVF bypasses the fallopian tubes and the peritoneal environment entirely, addressing several of the mechanisms by which endometriosis impairs natural fertility. Pregnancy rates with IVF in women with endometriosis are generally comparable to other diagnoses when ovarian reserve is adequate.

Nutrition, Supplements, and Lifestyle for Endometriosis and Fertility

While medical and surgical treatment addresses the structural and hormonal aspects of endometriosis, nutrition and supplementation play an important supporting role in managing inflammation and supporting reproductive health.

Anti-Inflammatory Diet

Endometriosis is fundamentally an inflammatory condition. An anti-inflammatory dietary approach can help manage symptoms and may support fertility:

• Increase omega-3 fatty acids (oily fish, flaxseed, walnuts) — omega-3s reduce prostaglandin production and systemic inflammation
• Increase antioxidant-rich foods (berries, leafy greens, colourful vegetables) — counteract oxidative stress that damages eggs and sperm
• Reduce processed foods, refined carbohydrates, and trans fats — these promote inflammatory pathways
• Consider reducing red meat consumption — associated with increased endometriosis risk in some studies
• Limit caffeine and alcohol — both linked to increased inflammation and reduced fertility

Key Supplements

• Folate/Folic acid: Essential for pre-conception and early pregnancy neural tube development; look for the active methylfolate form for better absorption
• Vitamin D: Many Australian women are deficient; Vitamin D has immune-modulating properties relevant to endometriosis and has been associated with improved IVF outcomes
• N-acetyl cysteine (NAC): An antioxidant with specific research showing reduced endometrioma size and improved fertility outcomes
• Omega-3 fatty acids: Supplemental fish oil reduces prostaglandin-driven inflammation relevant to endometriosis
• Magnesium: Supports muscle relaxation (relevant for pain) and is involved in hundreds of biochemical reactions including those related to reproductive health

Conceive Plus women's fertility supplements are formulated with the key nutrients that support reproductive health, including folate, vitamin D, and essential minerals. Explore our range at Conceive Plus Australia.

Emotional Health and Endometriosis

The psychological impact of endometriosis — particularly when combined with fertility challenges — is profound and often underestimated. Chronic pain, diagnostic delays (the average diagnostic delay in Australia is 6.5–12 years), repeated treatment failures, and uncertainty about the future all contribute to significant rates of anxiety and depression in women with endometriosis.

Research has found that:

• Women with endometriosis are 3 times more likely to experience depression than women without the condition
• The fertility-related quality of life impact of endometriosis is comparable to that of cancer in some measures
• Psychosocial support — counselling, support groups, and peer connection — significantly improves quality of life and psychological resilience during fertility treatment

Endometriosis Australia (endometriosisaustralia.org) provides condition-specific support and connects women with specialists and support networks across Australia.

Endometriosis and the Two-Week Wait

For women with endometriosis who are trying to conceive — whether naturally or with ART — the two-week wait (TWW) carries particular emotional weight. Uncertainty about implantation, combined with the background of chronic illness management, makes this period especially challenging.

Practical strategies for the TWW with endometriosis:

• Continue any prescribed medications as directed by your specialist
• Maintain anti-inflammatory dietary practices
• Engage in gentle movement (walking, yoga) but avoid intense exercise during this phase
• Prioritise sleep and stress management — cortisol negatively affects the luteal phase
• Set a clear date for pregnancy testing to avoid testing too early and experiencing false negatives

When to See a Fertility Specialist

If you have a confirmed diagnosis of endometriosis and are trying to conceive, the standard recommendations for seeking specialist care are adjusted:

• If you're under 35 with Stage I–II endometriosis and have been trying for 6+ months without success, consider a consultation
• If you're under 35 with Stage III–IV endometriosis, seek specialist review before or shortly after you start trying
• If you're 35 or older with any stage of endometriosis, seek specialist review immediately when you decide to try to conceive
• If you have significant symptoms affecting quality of life, see a gynaecologist regardless of where you are in your conception journey

Endometriosis specialists (many of whom are subspecialty-trained gynaecologists or reproductive endocrinologists) can offer a tailored treatment plan that considers both your current symptoms and your fertility goals.

Frequently Asked Questions About Endometriosis and Fertility

Q: Will I need IVF if I have endometriosis?
A: Not necessarily. Many women with endometriosis conceive naturally or with minimal intervention (IUI, surgery). The need for IVF depends on the stage of the disease, your ovarian reserve, whether your tubes are patent, and how long you've been trying without success.

Q: Does pregnancy help endometriosis?
A: Pregnancy can temporarily suppress endometriosis activity because the high progesterone environment of pregnancy inhibits the growth of endometrial lesions. However, endometriosis generally returns after pregnancy, particularly after breastfeeding ends when oestrogen rises again.

Q: Can endometriosis prevent me from carrying a pregnancy?
A: Endometriosis primarily affects the ability to conceive rather than carry a pregnancy. However, women with endometriosis do have slightly higher rates of miscarriage, preterm birth, and placenta praevia — risks that a specialist should monitor throughout pregnancy.

Q: How does endometriosis affect egg quality?
A: The inflammatory environment created by endometriosis is associated with increased oxidative stress, which can impair egg quality. Endometriomas in particular have been associated with reduced egg quality in the affected ovary. Antioxidant supplementation is commonly recommended to address this.

Q: Should I have my endometrioma removed before trying IVF?
A: This is a nuanced decision. Small endometriomas (under 4cm) are generally left in place before IVF to protect ovarian reserve. Larger or symptomatic endometriomas may warrant surgical removal, but the risk of reserve reduction must be weighed against the potential benefit. Discuss this with your reproductive endocrinologist.

Q: Are there specialist endometriosis and fertility clinics in Australia?
A: Yes. Several reproductive medicine clinics in Australia have specific expertise in endometriosis-related fertility challenges. RANZCOG (Royal Australian and New Zealand College of Obstetricians and Gynaecologists) can help identify subspecialty-trained specialists.

Q: Can diet alone improve fertility with endometriosis?
A: Diet is a supporting tool, not a cure. An anti-inflammatory diet can reduce symptom burden, improve egg quality, and support overall reproductive health — but it should be part of a comprehensive treatment plan, not a substitute for medical management.

Q: How long should I try naturally before seeking treatment for endometriosis?
A: Given the potential for disease progression, most specialists recommend earlier referral for women with endometriosis than for the general TTC population. If you're under 35 with confirmed endometriosis, 6 months of natural trying is a reasonable maximum before seeking specialist input.

Q: Does endometriosis affect male fertility?
A: Endometriosis is a condition affecting the female reproductive system. However, some research suggests that anti-endometrial antibodies produced in women with endometriosis may reduce sperm function — this is one reason why male factor assessment is important even when endometriosis is confirmed in the female partner.

Q: Will my children inherit endometriosis?
A: Endometriosis has a hereditary component. Having a first-degree relative (mother or sister) with endometriosis increases a woman's risk by approximately 7-fold. The condition is influenced by multiple genes, however, and not all daughters of affected women will develop it.

Moving Forward: Endometriosis and Your Fertility Journey

An endometriosis diagnosis in the context of trying to conceive can feel overwhelming. The combination of chronic pain, fertility uncertainty, and the complexity of treatment options is genuinely challenging. But it's important to recognise that most women with endometriosis — even those with significant disease — do go on to have successful pregnancies with appropriate support.

The keys to navigating endometriosis and fertility effectively are: early and accurate diagnosis, a specialist team that understands both conditions, comprehensive nutritional and lifestyle support, and proactive fertility planning that considers your age, reserve, and disease stage.

Conceive Plus is committed to supporting women through every stage of their fertility journey. Our supplements are formulated with the nutrients that matter most for reproductive health, designed to complement your medical treatment plan. Visit Conceive Plus Australia to explore our full range and find the right support for your journey.