Endometriosis is one of the most common conditions we see in our fertility practice. It affects an estimated 10-15% of women of reproductive age and is present in up to 50% of women struggling with infertility. Yet despite its prevalence, it remains poorly understood by many patients — and unfortunately, often diagnosed late.
How Endometriosis Affects Fertility
Endometriosis can impair fertility through multiple mechanisms:
- Anatomical distortion — Adhesions (scar tissue) can displace the ovaries, block or kink the fallopian tubes, and prevent normal egg pick-up
- Ovarian damage — Endometriomas (chocolate cysts) can destroy healthy ovarian tissue and reduce egg reserve
- Inflammatory environment — Endometriosis creates a hostile pelvic environment with inflammatory factors that may impair sperm function, egg quality, and embryo implantation
- Tubal dysfunction — Even without complete blockage, inflammation can impair normal tubal function and transport
- Endometrial receptivity — Some evidence suggests endometriosis may affect the uterine lining's ability to accept an embryo
Diagnosis: Why It Takes So Long
The average time from symptom onset to endometriosis diagnosis is 7-10 years. This delay occurs because:
- Painful periods are normalised ("all women have period pain")
- Symptoms overlap with other conditions (IBS, urinary infections)
- Ultrasound can miss superficial endometriosis (only endometriomas are clearly visible)
- Definitive diagnosis historically required laparoscopy (surgery)
If you have progressive period pain, pain during intercourse, chronic pelvic pain, or difficulty conceiving — please raise the possibility of endometriosis with your doctor. Early diagnosis enables earlier treatment and better fertility preservation.
Treatment Options for Fertility
Expectant Management (Mild Endometriosis)
For young women with minimal/mild endometriosis (Stage I-II), natural conception is still possible. A 6-12 month trial of natural conception or IUI may be appropriate, particularly if tubes are patent and other factors are normal.
Surgical Treatment
Laparoscopic surgery to excise endometriosis can significantly improve natural conception rates, particularly in moderate disease. The benefit is most pronounced in the first 6-12 months after surgery.
When surgery helps most:
- Endometriomas >3-4cm (cystectomy)
- Deep infiltrating endometriosis causing anatomical distortion
- Dense adhesions blocking or displacing tubes and ovaries
- Young women (<35) with time to try naturally post-surgery
Surgical considerations:
- Surgery on endometriomas can reduce ovarian reserve — minimal cyst wall excision is important
- Repeated surgeries carry cumulative risk to ovarian tissue
- Post-operative natural conception window is limited (6-12 months before recurrence)
IVF (In Vitro Fertilisation)
IVF may be the most appropriate first-line treatment when:
- Woman is over 37 and time is limited
- Previous surgery has not resulted in pregnancy
- Ovarian reserve is already compromised
- Additional factors are present (male factor, tubal damage)
- Severe disease makes surgical correction unlikely to restore natural function
IVF success rates in women with endometriosis are slightly lower than in women without the condition, but IVF remains highly effective — particularly when eggs are retrieved from relatively unaffected ovaries.
Fertility Preservation
For young women with endometriosis who are not ready for pregnancy, we increasingly recommend considering egg freezing. Endometriosis is progressive — it can silently reduce ovarian reserve over time. Freezing eggs now preserves your current fertility potential against future decline.
The Treatment Decision: Surgery vs IVF
This is one of the most nuanced decisions in reproductive medicine. The answer depends on:
- Age: Younger women have more time to benefit from surgical intervention; older women may benefit more from proceeding directly to IVF
- Ovarian reserve: If AMH is already low, surgery on endometriomas carries risk of further reducing reserve
- Disease extent: Mild disease may respond well to surgery; extensive disease may be better bypassed with IVF
- Symptoms: If pain is a significant issue, surgery addresses both pain and fertility
- Previous treatment: If previous surgery didn't result in pregnancy, repeating surgery has diminishing returns
Living with Endometriosis
Endometriosis is a chronic condition that requires long-term management. Beyond fertility treatment, a multidisciplinary approach including pain management, physiotherapy, psychological support, and lifestyle modifications can significantly improve quality of life.
If you have endometriosis and are concerned about your fertility — now or in the future — we encourage you to seek specialist advice early. The sooner we understand your individual situation, the more options we can offer.