Endometriosis and fertility treatments

By Marta Wais MD | March 9, 2025

Endometriosis is a condition that affects millions of women worldwide, often leading to chronic pain and fertility challenges. While it does not automatically mean infertility, endometriosis can impact reproductive health in various ways, making fertility treatments an essential consideration for many patients. This guide explores the relationship between endometriosis and fertility treatments, outlining the best approaches, potential challenges, and what patients need to know.

Read about Endometriosis explained with Dr. Zeni, Endometriosis Surgeon

Read about The impact of endometriosis on fertility treatment outcomes

Understanding the Impact of Endometriosis on Fertility

Endometriosis affects fertility in several ways:

  • Inflammation and Scarring: The presence of endometrial tissue outside the uterus can lead to chronic inflammation, which can affect egg quality and implantation.
  • Blocked Fallopian Tubes: Severe endometriosis can cause adhesions and scarring that obstruct the fallopian tubes, preventing fertilization.
  • Ovarian Dysfunction: Endometriosis-related ovarian cysts (endometriomas) can impair ovarian function and reduce the ovarian reserve.

Despite these challenges, many women with endometriosis successfully conceive naturally or with fertility treatments.

Fertility Treatment Options for Endometriosis Patients

1. Timed Intercourse and Ovulation Induction

For younger women with no other significant fertility issues, timed intercourse combined with ovulation induction can be an option.

  • Medications like Letrozole may be prescribed to stimulate ovulation.
  • Regular monitoring of ovulation through ultrasound and hormone testing helps time intercourse for the best chance of conception.
  • Success rates remain around 10-15% per cycle, similar to those without endometriosis.

2. Intrauterine Insemination (IUI)

  • IUI is often recommended when endometriosis is present but fallopian tubes remain open.
  • Sperm is directly inserted into the uterus to improve fertilization chances.
  • Success rates for IUI in endometriosis patients are approximately 10-15% per cycle.
  • There are no special protocols for IUI in endometriosis patients, although managing pain and inflammation is important.

3. In Vitro Fertilization (IVF)

For patients with concomitant fertility concerns or who have failed TIC and/or IUIl, IVF is the most effective option.

  • Ovarian Stimulation Considerations:
    • Patients with endometriosis may have lower ovarian reserves, requiring individualized stimulation protocols.
    • The presence of endometriomas can make egg retrieval more complex.
    • Some patients may experience increased pain during ovarian stimulation.
  • Egg Retrieval and Infection Risks:
    • Endometriomas and hydrosalpinx (fluid-filled fallopian tubes) increase infection risk.
    • Patients are given IV and/or oral antibiotics to reduce complications.
  • Embryo Transfer Considerations:
    • Fresh vs. Frozen Embryo Transfer (FET) strategies vary based on endometriosis severity, treatment goals and number of eggs retrieved.

Addressing Challenges in IVF for Endometriosis

  1. Difficult Access to Ovaries:
    • Scar tissue and adhesions can make egg retrieval challenging.
    • In some cases, transabdominal retrieval (going through the abdominal wall) is necessary.
  2. Risk of Ovarian Hyperstimulation Syndrome (OHSS):
    • Endometriosis patients can have variable ovarian reserve; some have a high follicle count, increasing OHSS risk.
    • Antagonist protocols with GnRH agonist triggers are commonly used to mitigate this.
  3. Pain Management During IVF:
    • Increased pelvic inflammation can make stimulation cycles more painful.
    • Patients may require additional pain management strategies, such as NSAIDs or temporary hormone suppression before IVF.

Choosing the Right IVF Protocol

There is no single best IVF protocol for endometriosis patients. However, the two main approaches include:

  • Antagonist Protocols:
    • Shorter, with fewer side effects and lower OHSS risk.
    • Preferred for most patients, as it provides flexibility in ovarian response.
  • Long Agonist Protocols:
    • Previously used for prolonged suppression of endometriosis before stimulation.
    • New studies suggest suppression before IVF is not always necessary.

Should Surgery Be Considered Before IVF?

  • When is Surgery Recommended?
    • Presence of hydrosalpinx, which reduces implantation rates if a fresh transfer is being considered
    • Severe pain that impacts daily life and treatment.
  • When is Surgery NOT Recommended?
    • If ovarian reserve is already low, surgery may further reduce egg count.
    • When fertility preservation (egg or embryo freezing) is prioritized before intervention.

Managing Endometriosis Post-IVF

  • Hormonal Suppression Post-Retrieval: Some patients benefit from hormonal therapy (e.g., Visanne, birth control pill) between egg retrieval and embryo transfer to reduce inflammation.
  • Frozen Embryo Transfer (FET) Strategy: Many specialists recommend delaying embryo transfer and using a natural cycle protocol to minimize the use of additional hormones that may cause endometriosis to flare
  • Some FET protocols use medications to suppress endometriosis for a while before “adding back” hormones to grow the uterine lining.
  • There is no universally accepted “best” FET protocol for patients with endometriosis!

Endometriosis presents unique challenges in fertility treatment, but successful conception is still possible with the right approach. Whether using timed intercourse, IUI, or IVF, a tailored treatment plan considering ovarian reserve, inflammation levels, and pain management is essential. Consulting a fertility specialist experienced in managing endometriosis can significantly improve outcomes and help patients navigate their fertility journey with confidence.

Posted in Diagnostic Testing