Endometriosis and fertility

Endometriosis occurs when tissue similar to the lining of the uterus (endometrium) grows outside the uterus, most commonly on the ovaries, fallopian tubes, and pelvic lining.

How endometriosis develops:

This misplaced tissue responds to hormonal changes during the menstrual cycle, thickening and breaking down just like the uterine lining. However, because this tissue has no way to exit the body, it becomes trapped, leading to inflammation, scarring, and adhesions.

Common symptoms:

• Painful periods (dysmenorrhea)
• Pain during intercourse
• Pain with bowel movements or urination
• Chronic pelvic pain
• Heavy or irregular periods
• Fatigue

Important to know:

Symptom severity doesn't always correlate with disease extent. Some women with severe endometriosis have mild symptoms, while others with minimal disease have significant pain.

Stages of endometriosis:

Endometriosis is classified into four stages (I-IV):

• Stage I (Minimal): Few superficial implants
• Stage II (Mild): More and deeper implants
• Stage III (Moderate): Many deep implants, small cysts on ovaries, some adhesions
• Stage IV (Severe): Many deep implants, large cysts on ovaries (endometriomas), extensive adhesions

The stage doesn't perfectly predict fertility impact - some women with Stage I struggle to conceive while others with Stage IV conceive naturally.

Approximately 30-50% of women with endometriosis experience infertility. The condition can affect fertility in several ways:

Physical barriers:

Fallopian tube damage:

Adhesions and scarring can block or damage the fallopian tubes, preventing egg and sperm from meeting.

Ovarian impact:

Endometriomas (chocolate cysts) can damage ovarian tissue and reduce egg supply. Surgery to remove them may also affect ovarian reserve.

Egg quality:

Some research suggests endometriosis may affect egg quality, though this is still being studied.

Inflammatory environment:

Endometriosis creates an inflammatory environment in the pelvis that may:

• Affect egg development
• Impair sperm function
• Interfere with fertilisation
• Impact embryo implantation

Anatomical distortion:

Severe adhesions can distort pelvic anatomy, affecting:

• Ovum pickup by the fallopian tubes
• Egg transport
• Overall reproductive function

The fertility outlook:

Despite these challenges:

• Many women with endometriosis conceive naturally
• Mild endometriosis has less impact on fertility
• Treatment can significantly improve conception chances
• IVF is an effective option when other approaches don't work

Monthly fecundity rates:

• Normal fertility: approximately 15-25% per cycle
• Mild endometriosis: approximately 8-12% per cycle
• Moderate to severe: approximately 2-5% per cycle without treatment

Treatment for endometriosis-related fertility depends on several factors including disease severity, age, and how long you've been trying to conceive:

Expectant management (trying naturally):

For young women with mild endometriosis and no other fertility factors:

• May try naturally for 6-12 months
• Monthly conception rates are lower but not zero
• Appropriate when time isn't a critical factor

Surgery (laparoscopy):

Potential benefits:

• Removes or destroys endometriosis implants
• Breaks up adhesions
• Removes endometriomas
• May restore normal anatomy
• Can improve natural conception rates for 12-18 months post-surgery

Considerations:

• Fertility benefits may be temporary
• Surgery on ovaries can reduce ovarian reserve
• Best performed by specialists experienced in endometriosis surgery
• Most beneficial for moderate to severe disease

Ovulation induction with IUI:

• Controlled ovarian stimulation with clomiphene or letrozole
• Intrauterine insemination (IUI) to place sperm directly in the uterus
• May improve conception rates, especially after surgical treatment
• Typically 3-6 cycles are attempted

IVF (In Vitro Fertilisation):

Recommended when:

• Fallopian tubes are damaged or blocked
• Other treatments haven't worked
• Moderate to severe endometriosis
• Age or other factors suggest time is limited

IVF success rates with endometriosis are slightly lower than average but still good, particularly with experienced centres.

Navigating fertility with endometriosis requires a thoughtful approach:

Seek specialist care:

Endometriosis is a complex condition. Working with specialists who understand both endometriosis and fertility is crucial:

• Reproductive endocrinologists (fertility specialists)
• Gynaecologists with expertise in endometriosis
• Centres experienced in endometriosis surgery

Don't delay:

If you have endometriosis and want children:

• Start trying when you're ready rather than waiting
• Seek help earlier than the standard guidelines suggest
• Consider fertility preservation if you're not ready but have significant disease

Understand your options:

Discuss with your doctor:

• Whether surgery might help your specific situation
• Whether medical treatment might buy time
• When to move to IVF if other approaches don't work
• The impact of any proposed surgery on your ovarian reserve

Manage symptoms:

Endometriosis symptoms can impact quality of life and relationships. Pain management and symptom control are important alongside fertility treatment.

Emotional support:

Living with endometriosis and facing fertility challenges is difficult:

• Seek support from endometriosis and fertility communities
• Consider counselling or therapy
• Communicate openly with your partner
• Be patient with yourself

Lifestyle factors:

While they won't cure endometriosis, healthy habits support overall fertility:

• Anti-inflammatory diet
• Regular gentle exercise
• Stress management
• Adequate sleep