Understanding Endometriosis
Endometriosis is a condition where tissue similar to the uterine lining grows outside the uterus, most commonly on the ovaries, fallopian tubes, and pelvic lining. This tissue responds to hormonal cycles, causing inflammation, pain, and scarring. Endometriosis is staged from minimal (Stage I) to severe (Stage IV), though symptoms do not always correlate with stage. Common symptoms include painful periods, chronic pelvic pain, pain during sex, and infertility. Some women have no symptoms and only discover endometriosis when investigating infertility.
How Endometriosis Affects Fertility
Anatomical distortion: Scar tissue (adhesions) and endometriomas can distort the fallopian tubes and ovaries, preventing egg release or capture.
Inflammation: The inflammatory environment created by endometriosis may be toxic to eggs, sperm, or embryos.
Egg quality: Some research suggests endometriosis may affect egg quality, particularly with ovarian endometriomas.
Implantation: The uterine environment may be less receptive to embryo implantation.
Ovarian reserve: Endometriomas and their surgical treatment can reduce ovarian reserve.
The impact on fertility varies widely. Many women with minimal endometriosis conceive naturally, while severe disease may require more intensive treatment.
Natural Conception with Endometriosis
Many women with mild to moderate endometriosis conceive naturally without treatment. The monthly fecundity rate (chance of conception per cycle) is lower than in women without endometriosis, but cumulative rates over time can still be reasonable, especially for younger women. Optimising timing of intercourse, maintaining a healthy lifestyle, and managing symptoms can support natural conception. If you are under 35 with mild endometriosis, trying naturally for 6-12 months before seeking fertility treatment is often recommended. If you are over 35 or have more severe disease, earlier intervention may be advised.
Surgical Treatment
Laparoscopic surgery to remove endometriosis lesions can improve fertility, particularly for mild to moderate disease.
Studies show improved natural conception rates in the months following surgery for mild endometriosis.
For endometriomas (ovarian cysts), surgery must balance removing the cyst with preserving ovarian tissue.
Surgery for severe endometriosis can improve anatomy but may not improve fertility as much as for milder disease.
Repeated surgeries should be avoided if possible, as they can reduce ovarian reserve.
The timing of surgery relative to fertility treatment requires careful consideration and should be discussed with your specialist.
Fertility Treatments
Ovarian stimulation with IUI: May help for mild endometriosis, though evidence of benefit is limited.
IVF: Often recommended for moderate to severe endometriosis, failed surgery, or when tubes are affected. IVF bypasses many of the barriers created by endometriosis.
GnRH agonist pretreatment: Using medications to suppress endometriosis before IVF may improve outcomes in some cases.
Egg freezing: May be considered for women with endometriosis who want to preserve fertility for the future, especially if ovarian reserve is threatened.
Success rates with IVF for endometriosis are somewhat lower than average but still good, particularly with appropriate pretreatment.
Managing Symptoms While Trying to Conceive
Managing endometriosis pain while trying to conceive requires different approaches than long-term management. Hormonal treatments that suppress endometriosis also prevent pregnancy and must be stopped when trying to conceive. Pain management options include non-steroidal anti-inflammatory drugs (during the first half of the cycle only), heat therapy, and lifestyle modifications. Complementary therapies such as acupuncture, yoga, and pelvic floor physiotherapy may help some women. Working closely with your healthcare team to balance symptom management with fertility goals is essential.