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Endometriosis and Pregnancy: What the Research Shows

Endometriosis can reduce fertility, but many people with the condition — including those with moderate to severe disease — conceive naturally or with fertility treatment. Among women with infertility, endometriosis is found in 25–50 percent of cases [3]. The degree of impact depends on disease stage, implant location, and individual factors that a reproductive endocrinologist can assess.

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How does endometriosis affect fertility?

Endometriosis affects an estimated 10 percent (190 million) of reproductive age women worldwide 3. Among those seeking care for infertility, as many as 25–50 percent have endometriosis — making it one of the most common identifiable contributors to subfertility 3.

The condition interferes with conception in several ways:

  • Altered anatomy. Adhesions can distort the fallopian tubes or fuse the ovaries to surrounding structures, blocking the egg's path.
  • Reduced ovarian reserve. Endometriomas (cysts on the ovaries) can damage egg-bearing tissue. Surgical removal of these cysts can itself reduce reserve, so the decision to operate before fertility treatment is made carefully 1.
  • Inflammatory environment. The peritoneal fluid in some people with endometriosis contains elevated inflammatory mediators that may impair egg quality or sperm function.
  • Implantation disruption. A 2024 meta-analysis found a statistically significant reduction in implantation rates in women with endometriosis undergoing IVF (OR 0.85), even when overall pregnancy and live birth rates were comparable to other infertility causes 2.

Does stage predict whether you can get pregnant?

Endometriosis is staged I through IV (minimal, mild, moderate, severe) based on a scoring system that counts the number, size, and depth of implants plus the degree of adhesions. Higher stage generally correlates with lower spontaneous conception rates — stage III and IV disease tends to involve more distorted anatomy and larger endometriomas 1.

That said, stage alone is an imperfect predictor. Some people with stage IV disease conceive without intervention; others with stage I have unexplained subfertility from other causes. A thorough fertility evaluation — including ovarian reserve testing (anti-Müllerian hormone, antral follicle count) and a semen analysis of a partner if applicable — gives a much clearer individual picture than stage alone.

What are the options for conceiving with endometriosis?

Trying naturally. For people with stage I or II disease, no prior infertility workup issues, and adequate ovarian reserve, a period of timed intercourse is often reasonable before moving to intervention — especially for younger individuals.

Ovulation induction with intrauterine insemination (IUI). Adding medications to stimulate ovulation and placing processed sperm directly into the uterus can modestly improve conception rates in mild to moderate disease.

In vitro fertilization (IVF). IVF bypasses the tubes entirely and is typically the most effective option for moderate to severe endometriosis, prior failed cycles, or diminished ovarian reserve. A 2024 systematic review and meta-analysis of 40 studies (8,970 women with endometriosis, 42,946 controls) found that overall live birth and clinical pregnancy rates with IVF were not significantly different from other infertility diagnoses, though implantation rates were modestly reduced 2.

Surgery before fertility treatment. Laparoscopic excision or ablation of endometriosis lesions may improve spontaneous conception rates in some cases, though evidence that surgery before IVF improves IVF outcomes is mixed. For large endometriomas (generally over 4 cm), a reproductive endocrinologist often weighs the risk to remaining ovarian tissue very carefully 1.

Fertility preservation. For people not yet trying to conceive but concerned about future fertility — particularly those needing repeat surgeries — egg freezing is an option worth discussing sooner rather than later.

Does having endometriosis affect pregnancy itself?

Most people with endometriosis who become pregnant carry to term without major complications. Some studies have found modestly increased risks of preterm birth, placenta previa, and cesarean delivery compared with the general population, though the absolute differences are generally small and many pregnancies are uncomplicated. Prenatal care with a provider aware of the diagnosis is appropriate.

What kind of specialist should you see?

A reproductive endocrinologist (RE) — a gynecologist with additional subspecialty training in fertility — is best positioned to evaluate endometriosis-related infertility and recommend a treatment path. Your gynecologist or ob-gyn may initiate the workup and refer if fertility has not been achieved after a defined period — most guidelines suggest not waiting the standard 12 months if endometriosis is already diagnosed. A proactive conversation after six months of trying — or sooner if there are other concerns like older age or prior surgery — is generally appropriate.

Common questions

Is stage 3 endometriosis the same as being infertile?

No. Stage 3 (moderate) endometriosis is associated with lower spontaneous conception rates, but many people with stage 3 disease conceive — some naturally and many with fertility treatment such as IVF. Stage is one variable among several that a reproductive endocrinologist considers.

Will treating endometriosis medically (hormones) help me get pregnant?

Hormone-suppressing treatments like birth control pills, progestins, or GnRH agonists are effective for pain but suppress ovulation and cannot be used while actively trying to conceive. These treatments do not improve long-term fertility; once stopped, the approach shifts to either natural conception or fertility treatment.

How quickly should someone with endometriosis seek a fertility evaluation?

Most guidelines suggest not waiting the standard 12 months if endometriosis is already diagnosed. A proactive conversation with a gynecologist or referral to a reproductive endocrinologist after six months of trying — or sooner if there are other concerns like older age or prior surgery — is generally appropriate.

Does pregnancy cure endometriosis?

No. Pregnancy (and breastfeeding) often suppresses symptoms temporarily because ovulation and menstruation pause, but the underlying disease does not disappear. Symptoms typically return after delivery and the resumption of menstruation. Endometriosis is a chronic condition that is managed, not cured.

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When to contact a clinician

  • —Sudden, severe pelvic pain — can signal a ruptured ovarian cyst (endometrioma)
  • —Heavy or irregular bleeding that is new or worsening
  • —No pregnancy after 6 months of trying with known endometriosis
  • —Pain severe enough to interfere with daily life or work

If you develop sudden severe abdominal pain, especially with dizziness or fainting, seek emergency care immediately.

This article is general health education and does not replace a consultation with a reproductive endocrinologist or ob-gyn. Individual fertility prognosis depends on factors only a clinician can assess.

References

  1. 1.American College of Obstetricians and Gynecologists (2010). Management of Endometriosis: ACOG Practice Bulletin, Number 114 (Reaffirmed 2022). Obstetrics & Gynecology. doi:10.1097/AOG.0b013e3181e8b073 ✓Staging system, fertility implications, surgical considerations (endometrioma vs. ovarian reserve), and management approaches for endometriosis-related infertility
  2. 2.Mappa I, Page ZP, Di Mascio D, Patelli C, D'Antonio F, Giancotti A, Gebbia F, Mariani G, Cozzolino M, Muzii L, Rizzo G (2024). The Effect of Endometriosis on In Vitro Fertilization Outcomes: A Systematic Review and Meta-Analysis. Healthcare (Basel). doi:10.3390/healthcare12232435 ✓Meta-analysis of 40 studies (8,970 women with endometriosis): IVF live birth and pregnancy rates not significantly different from controls, but implantation rate modestly reduced (OR 0.85, p=0.02)
  3. 3.World Health Organization (2025). Endometriosis. WHO Fact Sheets. link ✓Endometriosis affects approximately 10% (190 million) of reproductive-age women worldwide; among women with infertility, 25–50% have endometriosis

3 sources, numbered by first appearance. General health information, not medical advice — synthetic demonstration content.