Endometriosis and Infertility: How It Affects Conception

• Endometriosis is found in 25 to 50 percent of women being investigated for infertility, yet around half to two-thirds of women with endometriosis still conceive, many without IVF.
• It affects fertility through several routes at once: distorted pelvic anatomy, inflammatory pelvic fluid, reduced egg reserve from ovarian cysts, and poorer embryo implantation.
• Symptom severity does not predict fertility impact, some women with severe pain conceive easily, while others with no pain struggle.
• Treatment is staged: laparoscopic surgery and timed conception or IUI for milder disease, IVF for severe disease or when simpler options fail.
• Because endometriomas steadily lower egg reserve, do not delay, discuss fertility, ovarian reserve testing and even egg freezing early in your care.

Endometriosis affects roughly 10 percent of women of reproductive age, but it is far more common among women who are struggling to conceive. International guidelines from ESHRE and the American Society for Reproductive Medicine (ASRM) report endometriosis in around 25 to 50 percent of women investigated for infertility, and Indian fertility centres consistently report similar figures. ICMR-funded research from AIIMS Delhi and PGIMER Chandigarh has confirmed that endometriosis is a major contributor to female infertility in India.

The link runs both ways. Women with endometriosis have higher rates of infertility than the general population, around 30 to 50 percent experience some difficulty conceiving, and women being investigated for infertility have higher rates of endometriosis. Yet this also means roughly half to two-thirds of women with endometriosis conceive, which is an important counterweight to the fear that a diagnosis means certain childlessness.

One of the most striking features is that symptom severity does not predict fertility. Many women with endometriosis-related infertility have little or no pelvic pain and are diagnosed only during their infertility workup, which is part of why endometriosis is sometimes called a great mimicker. Others have severe period pain yet conceive without trouble.

In India, the disease itself is no more common than in other populations, but diagnosis is often delayed because severe period pain is normalised and endometriosis expertise is concentrated in larger cities. If you have been trying for 12 months, or 6 months if you are over 35, endometriosis should be part of the workup alongside a semen analysis, ovulation assessment, tubal patency testing and ovarian reserve testing.

• Distorted pelvic anatomy: implants, scar tissue (adhesions) and ovarian endometriomas (chocolate cysts) can pull the fallopian tubes out of position, so the fimbrial end of the tube cannot sweep over the ovary and pick up the egg. This matters most in moderate to severe (stage III to IV) disease.
• Inflammatory pelvic fluid: endometriosis implants release inflammatory chemicals and prostaglandins into the fluid around the ovaries and tubes. This environment can impair sperm movement, fertilisation and early embryo development.
• Reduced egg reserve: endometriomas damage the surrounding healthy ovarian tissue, lowering the egg supply measured by AMH and antral follicle count. Surgery to remove the cysts can reduce reserve further.
• Poorer implantation: the uterine lining in women with endometriosis can show altered gene activity and progesterone resistance, so even a good embryo may struggle to implant.
• Altered ovulation and egg quality: endometriosis is sometimes linked with luteal phase problems and reduced oocyte quality.
• Immune changes: shifts in immune cell activity may affect implantation and early pregnancy in some women.

When endometriosis is suspected as a cause of infertility, your doctor combines your history, an examination and a few investigations to build the full picture and stage the disease.

Your history covers classic clues: period pain that worsens over the years, deep pain during sex, chronic pelvic pain, pain on opening the bowels or passing urine during periods, fatigue and pre-period spotting. A first-degree relative with endometriosis raises your own risk several-fold, our guide to whether endometriosis is hereditary covers this. A pelvic and rectovaginal examination may reveal nodules or a fixed uterus, but a normal exam does not rule endometriosis out.

Imaging is the next step. A transvaginal ultrasound by an experienced operator can pick up endometriomas, deep nodules and coexisting adenomyosis. An MRI of the pelvis with an endometriosis protocol is the most sensitive non-invasive scan for deep disease (typically Rs 8,000 to 18,000 privately, lower or free at AIIMS, PGIMER, Tata Memorial and other government tertiary centres). Because tubal disease often coexists, tubal patency is checked with an HSG (hysterosalpingography). Ovarian reserve testing, through an AMH test and antral follicle count, is essential because reduced reserve changes which treatment makes sense.

Laparoscopy remains the gold standard for a definitive diagnosis, because it lets the surgeon see and biopsy implants and treat them in the same sitting. However, ESHRE 2022 guidance no longer requires it before fertility treatment, empirical treatment can proceed on the basis of imaging if there is no clear surgical reason to operate. Our guide to laparoscopy for women in India explains what the procedure involves. CA-125 blood testing is often raised in endometriosis but is too non-specific to diagnose or monitor it.

Laparoscopic surgery aims to remove or destroy visible implants, take out endometriomas, divide adhesions and restore a more normal pelvis. It carries both diagnostic and treatment value, but it is not automatically the right first step for everyone.

For minimal to mild (stage I to II) disease, trials and meta-analyses show that treating the endometriosis at laparoscopy modestly improves natural pregnancy rates compared with simply looking and doing nothing, roughly 30 percent versus 18 percent over the following 9 to 12 months. For moderate to severe (stage III to IV) disease with significant distortion, surgery can improve natural conception more substantially in well-selected women.

The trade-off is the ovary. Stripping out an endometrioma removes the cyst more completely but takes healthy ovarian tissue with it and lowers AMH; gentler ablative techniques preserve more tissue. ESHRE and ASRM therefore advise caution: for women with cysts on both ovaries, previous endometrioma surgery, or already-low reserve, repeat surgery is often best avoided in favour of going straight to IVF. These decisions belong with a gynaecologist who has specific endometriosis expertise, our overview of endometriosis surgery walks through the options, risks and recovery.

Practical point: pregnancy rates are highest in the first 12 to 18 months after surgery, so if surgery is part of your plan, do not delay trying to conceive afterwards.

Hormonal treatments for endometriosis, the combined pill, progestins such as dienogest, GnRH agonists and antagonists, and aromatase inhibitors, are excellent for controlling pain but suppress ovulation, so they cannot be used while you are actively trying to conceive. Using them simply to treat endometriosis in the hope of boosting fertility afterwards is not recommended, because it only delays time to pregnancy without improving the odds.

They do have specific supporting roles. For severe disease or repeated IVF failure, a course of GnRH agonist downregulation for 2 to 3 months before IVF can improve pregnancy rates in some studies, by quietening the disease and improving the uterine lining. Dienogest is widely used between fertility attempts to control disease activity but must be stopped before trying to conceive.

Letrozole, an aromatase inhibitor, is the one medicine that can do double duty: it is used off-label for endometriosis pain and is also a mainstay of ovulation induction, the same drug used to time intercourse or IUI. It is inexpensive and widely available in India. For a fuller picture of how the hormonal options compare, see our practical guide to endometriosis pain management. Any decision to combine suppression with fertility treatment should be made with a reproductive endocrinologist.

For mild (stage I to II) endometriosis with open fallopian tubes, controlled ovarian stimulation with intrauterine insemination (IUI) is a reasonable first-line treatment, either after surgery or for women who prefer not to have surgery. The idea is to stimulate the ovaries gently with letrozole or low-dose gonadotropins to grow 2 to 3 mature follicles, then place washed sperm directly into the uterus around ovulation.

Pregnancy rates are around 11 to 15 percent per cycle in mild endometriosis, with cumulative rates of 30 to 40 percent over 3 to 4 cycles. ESHRE and ASRM recommend a maximum of 3 to 4 IUI cycles before moving to IVF, because the success per extra cycle falls sharply after that. Tracking your fertile window matters here, our guide to how to track ovulation covers the methods that help with timing.

IUI is not the right choice for everyone. It is not recommended for stage III to IV disease, because distorted anatomy compromises egg pickup however many follicles develop, nor when the tubes are blocked or when there is significant male-factor involved. If a semen analysis shows a problem, that changes the plan. Women over 35, or with low ovarian reserve, may be advised to skip IUI and go straight to IVF, our comparison of IUI versus IVF in India lays out how to weigh cost, time and success.

In-vitro fertilisation (IVF) is the most effective treatment for moderate to severe endometriosis and for women who have not conceived with simpler approaches. It works precisely because it bypasses most of the ways endometriosis interferes: eggs are collected directly from the ovaries, fertilisation happens in the laboratory away from inflammatory pelvic fluid, and the embryo is placed straight into the uterus.

Success depends heavily on age, disease stage, ovarian reserve and laboratory quality. Indian IVF outcomes broadly track international ESHRE and SART benchmarks: roughly 35 to 45 percent live birth per fresh transfer for women under 35, 30 to 35 percent at 35 to 37, 20 to 25 percent at 38 to 40, and 10 to 15 percent over 40. Cumulative live birth over 3 cycles can reach 60 to 70 percent for younger women. Because age is such a powerful driver, our guide to fertility and age is worth reading alongside this.

Endometriosis-specific factors matter too. Severe disease with cysts on both ovaries tends to yield fewer eggs and lower embryo quality; previous endometrioma surgery can reduce egg yield; and coexisting Adenomyosis vs Endometriosis: Differences, Diagnosis & Treatment lowers implantation. Many centres find frozen embryo transfer performs at least as well as fresh transfer in endometriosis, and a short course of GnRH agonist before IVF may help in severe disease. For a detailed, India-specific picture of pricing, protocols and realistic chances, see IVF in India: cost, process and success rates.

Because endometriomas steadily erode egg reserve over the years, and surgery can reduce it further, fertility preservation through egg freezing is increasingly offered to younger women with endometriosis who are not ready to conceive yet. ESHRE 2022 guidance recommends discussing it, particularly for women with stage III to IV disease or cysts on both ovaries, and for anyone planning endometrioma surgery who is worried about losing reserve.

The process mirrors the first half of IVF: the ovaries are stimulated, the eggs are collected, and mature eggs are vitrified (rapidly frozen) for the future. The realistic chance of a live birth from frozen eggs is around 25 to 35 percent per attempt and depends strongly on your age when you froze them, the younger, the better. For couples who already have a partner, freezing embryos rather than eggs may offer slightly better odds; our guide to freezing embryos versus eggs explains the difference, and egg freezing in India covers cost, eligibility and what to expect.

The key message is timing. These conversations are far more useful early, ideally around diagnosis in a younger woman, than after years of disease progression have already narrowed the options.

Endometriosis-related fertility treatment is a significant financial and emotional undertaking in India, and planning early helps. As a rough private-sector guide: gynaecology consultation Rs 500 to 3,000 (free at government hospitals), transvaginal ultrasound Rs 800 to 3,000, MRI pelvis Rs 8,000 to 18,000, AMH and hormone panel Rs 1,500 to 5,000, diagnostic laparoscopy Rs 35,000 to 1,50,000, operative laparoscopy Rs 60,000 to 3,50,000, an IUI cycle Rs 12,000 to 35,000, an IVF cycle Rs 1,50,000 to 3,50,000, and egg freezing Rs 1,50,000 to 3,00,000 per cycle plus annual storage. Most couples need more than one cycle, so total spends of Rs 3 to 10 lakh are common.

Access is improving. IRDAI has been expanding fertility coverage, several insurers now offer infertility riders, and some employer plans include limited benefits. Public-sector centres such as AIIMS Delhi, PGIMER Chandigarh, JIPMER, KEM Mumbai and CMC Vellore offer subsidised treatment for those who qualify, and the field is regulated under the Assisted Reproductive Technology (Regulation) Act, 2021.

The emotional toll is real and deserves the same attention as the medical plan. Infertility is strongly linked with anxiety and low mood, and counselling genuinely helps. Practical advice: choose a centre with real endometriosis experience, ask about cumulative live birth rates rather than just per-cycle figures, get all costs in writing, do not delay unnecessarily because reserve falls with both age and disease, seek a second opinion before major decisions, and lean on family and professional support throughout the journey.

• You have been trying to conceive for 12 months without success, or 6 months if you are 35 or older.
• You have severe or worsening period pain, deep pain during sex, or chronic pelvic pain, especially with a family history of endometriosis.
• You already have an endometriosis diagnosis and want to plan a pregnancy, so reserve and timing can be assessed before disease progresses.
• A scan has shown an ovarian endometrioma (chocolate cyst), which warrants a reserve check and a fertility-preservation discussion.
• Sudden severe one-sided pelvic pain with nausea or fainting needs emergency care, as it can signal a complication such as ovarian torsion or a ruptured cyst.

• ESHRE Guideline: Endometriosis (2022)
• ASRM: Endometriosis and Infertility — Committee Opinion
• World Health Organization: Endometriosis fact sheet
• NHS: Endometriosis
• Indian Council of Medical Research (ICMR) — National Guidelines for Accreditation, Supervision and Regulation of ART Clinics / ART Act 2021