If you have been diagnosed with endometriosis and are now trying to conceive, you have probably already encountered a great deal of conflicting and confusing information. Some sources suggest endometriosis has little impact on fertility. Others suggest it's a major obstacle. The truth, as is often the case in medicine, lives somewhere more nuanced in between.
One specific question I'm asked often is whether endometriosis can actually cause blocked fallopian tubes. The short answer is yes, it can, though the way it affects the tubes is a little different from infection-related blockage. Let's walk through exactly how.
What Is Endometriosis, briefly
Endometriosis is a condition in which tissue similar to the lining of the uterus (the endometrium) grows outside the uterus, most commonly on the ovaries, the outer surface of the uterus, the bowel, the bladder, and the fallopian tubes or the tissue surrounding them.
Like the normal uterine lining, this displaced tissue responds to your monthly hormonal cycle. It thickens, breaks down, and bleeds but because it has no way to exit the body the way a normal period does, this process triggers local inflammation. Over time, this repeated inflammation can lead to the formation of scar tissue and adhesions.
How Endometriosis affects the Fallopian tubes
There are actually two distinct ways endometriosis can interfere with tubal function, and it's worth understanding both.
1. Direct involvement of the tube. In some cases, endometrial-like tissue grows directly on or within the fallopian tube itself. Over time, this can cause inflammation and scarring within the tube, potentially leading to a true blockage similar to what occurs with infection-related damage.
2. Adhesions distorting pelvic anatomy. This is the more common mechanism. Endometriosis frequently causes adhesions bands of scar tissue that cause pelvic organs to stick together that shouldn't normally be connected. These adhesions can pull the fallopian tube out of its normal position, kink it, or fuse it to the ovary or surrounding tissue.
This second mechanism is particularly important to understand, because it means the tube may not be "blocked" in the traditional sense dye may even pass through it on an HSG test but its normal function can still be severely compromised. If the tube has been pulled out of position by adhesions, it may no longer be positioned correctly to capture the egg released from the ovary each month, even though the tube itself remains technically open.
This is one reason why endometriosis-related fertility issues are sometimes more accurately assessed through laparoscopy rather than HSG alone, since laparoscopy allows direct visualisation of the tube's position and mobility not just whether dye can pass through it.
Does every woman with Endometriosis have tubal damage?
No. Endometriosis exists on a wide spectrum, from mild and minimally invasive to severe and extensively scarring. Many women with mild or moderate endometriosis have completely normal, open, well-positioned fallopian tubes and no difficulty conceiving at all.
Tubal involvement becomes more likely with:
More advanced stages of endometriosis (Stage III or IV)
Endometriomas (cysts on the ovaries caused by endometriosis) located near the tubes
A longer duration of untreated or undiagnosed endometriosis
Previous surgery for endometriosis, which while often necessary and helpful can itself sometimes contribute to further adhesion formation
How is Endometriosis-related tubal involvement diagnosed?
HSG (hysterosalpingogram). This can detect a true blockage but may miss tubal distortion caused by adhesions if the dye still manages to pass through, even via an abnormal path.
Laparoscopy. This is considered the gold standard for assessing endometriosis-related fertility issues, because it allows direct visual inspection of the tubes, ovaries, and surrounding structures including their position, mobility, and any visible adhesions or endometrial implants. Laparoscopy can also be therapeutic, allowing your surgeon to remove adhesions or endometrial tissue during the same procedure.
Ultrasound. A standard pelvic ultrasound can sometimes detect endometriomas (ovarian cysts), which may suggest more advanced endometriosis, but it cannot reliably assess tubal patency or position on its own.
If you have known or suspected endometriosis and are facing fertility challenges, a conversation with your doctor about which combination of these tests is right for you is an important next step.
What are the treatment options?
Treatment depends heavily on the severity of your endometriosis, the extent of tubal involvement, your age, and your overall fertility goals. Broadly, options include:
Laparoscopic surgery to remove adhesions and endometrial tissue, which can sometimes restore normal tubal position and function, particularly in mild to moderate cases.
IVF, which bypasses the fallopian tubes entirely and is often recommended for more severe or extensive endometriosis-related tubal involvement, particularly when surgery is unlikely to fully restore function or when time is a significant factor.
A combined approach, where surgery is used first to optimise the pelvic environment, followed by either attempts at natural conception or IVF, depending on findings and outcomes.
There is no single "correct" answer that applies to every woman, this decision should be made collaboratively with your fertility specialist based on your specific findings.
An Integrative Perspective on Endometriosis and Fertility
Endometriosis is fundamentally an inflammatory condition, and this matters beyond just the question of tubal blockage. Chronic inflammation associated with endometriosis can also affect egg quality, implantation, and the overall hormonal environment needed for conception.
I approach endometriosis-related fertility concerns with a comprehensive view: addressing the structural tubal question is important, but so is supporting your body's broader inflammatory and hormonal balance through nutrition, lifestyle, and targeted interventions. This integrative approach works alongside not instead of appropriate surgical or fertility treatment.
Key Takeaways
Endometriosis can affect the fallopian tubes in two ways: direct involvement causing true blockage, or adhesions distorting the tube's position and function
A tube can appear "open" on HSG and still be functionally compromised by adhesions
Laparoscopy is the gold standard for assessing endometriosis-related tubal involvement, since it allows direct visualisation
Not every woman with endometriosis has tubal damage severity and duration matter
Treatment options range from laparoscopic surgery to IVF, often used in combination
Addressing the broader inflammatory nature of endometriosis is valuable alongside structural treatment
If you have endometriosis and are concerned about your fertility, please don't navigate this alone. The right combination of investigation and treatment can make a real difference.
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