Endometriosis and Infertility — Why 30-50% Have Difficulty Conceiving

Between 30% and 50% of women with endometriosis face difficulty conceiving. It is the most common diagnosable cause of infertility in women of reproductive age. The good news: most succeed in getting pregnant — either naturally or through assisted reproduction.

This guide explains exactly how endometriosis affects fertility, what treatment options you have, and when surgery vs. IVF is the right choice.

Why endometriosis affects fertility

Endometriosis does NOT directly cause infertility in every patient. When it does, the mechanisms are multiple and often combined:

1. Altered pelvic anatomy

Endometriotic tissue creates adhesions — scars that bind organs together. The result:

• The ovaries no longer release the ovum freely
• The fallopian tubes are blocked or distorted
• The ovum cannot be captured by the tube
• Sperm cannot reach the ovum

2. Reduced ovarian reserve

Ovarian endometriomas ("chocolate cysts") destroy healthy ovarian tissue:

• Ovarian follicles are replaced by endometriotic tissue
• Cyst pressure destroys adjacent follicles
• Every surgical intervention on the ovary further reduces the reserve

3. Altered oocyte quality

Chronic inflammation from endometriosis affects:

• Follicular maturation
• Oocyte DNA quality
• Fertilization capacity

Recent studies show that oocytes from women with advanced endometriosis have lower rates of fertilization and embryonic development.

4. Endometrial inflammation (implantation difficulties)

The endometrium (uterine lining) is altered by:

• Elevated inflammatory cytokine levels
• Altered uterine receptivity
• Genetic changes in the endometrium

The result: even when fertilization occurs, the embryo has difficulty implanting.

5. Associated adenomyosis

Many women with endometriosis also have adenomyosis (endometriosis of the uterus). Adenomyosis:

• Alters uterine architecture
• Increases menstrual bleeding
• Reduces implantation rates
• Increases the risk of miscarriage

How infertility should be evaluated when endometriosis is suspected

Step 1: History and clinical examination

• Complete menstrual history
• Symptoms suggestive of endometriosis (menstrual pain, dyspareunia)
• History of pregnancy and miscarriage
• Duration of attempts to conceive
• Gynecological examination

Step 2: Hormonal workup

• AMH (Anti-Müllerian Hormone) — assesses ovarian reserve
• FSH, LH, Estradiol on day 2-3 of the cycle
• Progesterone in the luteal phase
• Prolactin, TSH

Step 3: IDEA transvaginal ultrasound

The IDEA (International Deep Endometriosis Analysis) protocol evaluates:

• Ovarian reserve (antral follicle count)
• Ovarian endometriomas
• Uterine adenomyosis
• Deep infiltrating endometriosis
• Pelvic adhesions (sliding sign)

Step 4: Additional investigations (if needed)

• HSG (Hysterosalpingography) — assesses tubal patency
• Pelvic MRI — for complex DIE
• Partner semen analysis — 40% of cases also involve a male factor
• Diagnostic laparoscopy — only for uncertain cases or as part of surgery

Surgery vs. IVF — when to choose which?

This is one of the most important decisions. There is NO universal answer — it depends on many factors.

Combined approach — the most common

For many patients, the optimal approach is surgery + IVF:

1. Da Vinci robotic surgery for excision of endometriosis
2. 3-6 months of hormonal treatment post-surgery (optional)
3. Attempts at natural conception for 6-12 months
4. If pregnancy does not occur → IVF with much better results post-surgery

Da Vinci robotic surgery for fertility preservation

Robotic surgery is preferred in women who wish to conceive because of:

1. Preservation of healthy ovarian tissue

In ovarian cystectomy, robotic technique allows:

• Identification of the correct dissection plane
• Preservation of the ovarian capsule
• Delicate suturing without compromising the reserve

2. Fallopian tube surgery

Tubal reconstruction or salpingoplasty:

• 7 degrees of freedom for fine suturing
• 3D visualization with 10x magnification
• Restoration of patency

3. Myomectomy for fibroids

Large or intramural fibroids can affect implantation. Robotic myomectomy offers:

• Multi-layer suturing to prevent uterine rupture
• Uterine preservation
• Rapid recovery

What to do BEFORE trying to conceive

1. Fertility testing

Don't wait 12 months of attempts if you know you have endometriosis:

• Ages 30-35: start the workup after 6 months
• Ages 35+: start the workup immediately
• With known severe endometriosis: consult before trying

2. Preconception consultation

With Dr. Alin Constantin or another specialist:

• Assessment of endometriosis stage
• Measurement of ovarian reserve
• Personalized plan (surgery, IVF, or both)
• Oocyte preservation if you plan to delay pregnancy

3. Optimizing overall health

• Anti-inflammatory diet — Mediterranean, rich in Omega-3
• Supplements — Vitamin D, CoQ10, Omega-3, Folic acid
• Stress reduction — has a hormonal impact
• Moderate physical activity — 150 min/week
• Quitting smoking and alcohol
• Maintaining a healthy weight

Fertility after surgery for endometriosis — what to expect

Recovery period

• Physical recovery: 2-3 weeks
• Normal menstrual cycles within 1-2 months
• Optimal window for attempts: 3-6 months post-surgery

Success rates after surgery

When to move to IVF

If pregnancy does not occur within:

• 6-12 months post-surgery in women <35 years
• 3-6 months post-surgery in women >35 years
• Immediately if symptomatic recurrence appears

Risks and special considerations of pregnancy with endometriosis

Pregnancy in women with endometriosis carries a few elevated risks that need to be monitored:

• Preeclampsia — 2-3x higher risk
• Preterm birth — risk increased by ~20%
• Fetal growth restriction — more frequent
• Placenta previa — increased risk
• Uterine rupture — in pregnancies after myomectomy
• Cholestasis of pregnancy — more frequent

The good news: most pregnancies in women with endometriosis are normal, with appropriate monitoring. Pregnancy itself improves endometriosis symptoms during gestation.

Myth vs. Fact — top 5 myths

Related articles

• What is endometriosis — Complete guide 2026
• Robotic surgery for deep endometriosis
• Transvaginal ultrasound for endometriosis diagnosis
• Infertility service — full details

Last updated: July 2026 • Author: Dr. Alin Constantin, VP European Endometriosis League