Endometriosis affects roughly 1 in 10 women, and takes an average of seven years to diagnose. By then the fertility question often feels urgent. It doesn't have to be.
If you've had years of painful periods dismissed as "just bad cramps," or you've been told your pain is normal when it clearly isn't, this piece is for you.
Endometriosis affects roughly 1 in 10 women during their reproductive years. And yet the average time from first symptoms to diagnosis is seven years. Seven years of pain that gets minimised, misattributed to other conditions, or simply not taken seriously.
By the time most women get a diagnosis, the question of what it means for their fertility already feels urgent. It doesn't have to be.
Endometriosis is a condition in which tissue similar to the lining of your uterus, called the endometrium, grows outside the uterus. These growths, called lesions or implants, most commonly develop on the ovaries, fallopian tubes, the ligaments supporting the uterus, and the walls of the pelvic cavity. In more severe cases, they can appear on the bowel, bladder, or beyond.
Here's the problem with that tissue being where it shouldn't be: your uterine lining sheds every month during your period. The endometrial tissue outside the uterus responds to the same hormonal signals and tries to do the same, but it has nowhere to go. Instead, it bleeds into surrounding tissue, causing inflammation, scarring, and adhesions (bands of scar tissue that can cause organs to stick together).
Month after month, cycle after cycle. That's what's behind the pain.
One thing worth knowing clearly: the severity of your symptoms doesn't reflect the extent of the disease. Someone with minimal lesions can have debilitating pain. Someone with extensive disease can have almost none. This disconnect is one of the main reasons endometriosis gets missed, and why "your pain isn't that bad" has nothing to do with whether you have it.
The only definitive way to diagnose endometriosis is through laparoscopy, a minimally invasive surgical procedure in which a surgeon uses a small camera inserted into the abdomen to directly view lesions. There's no blood test for it. A pelvic ultrasound can detect certain types of endometriosis (particularly cysts on the ovaries) but misses many lesions entirely.
Because diagnosis requires surgery, many clinicians work with a "suspected endometriosis" diagnosis based on symptoms and examination findings first, which means starting treatment without ever fully confirming what's there.
The seven-year gap exists because the symptoms overlap with so many other conditions. IBS, pelvic inflammatory disease, ovarian cysts, and even anxiety are frequent misdiagnoses. Period pain gets normalised. Women get put on the pill, which can mask symptoms without addressing the underlying disease.
If you've been brushed off: track your symptoms specifically, when they occur, what they feel like, what makes them worse, and take that documentation to a specialist. A gynaecologist with endometriosis experience, or a fertility specialist, will take a detailed symptom history seriously in a way a general appointment often doesn't.
This is the part that matters most if fertility planning is on your radar, and the part women are least likely to hear clearly explained.
Endometriosis affects fertility through several connected mechanisms.
Scarring and tubal damage. Inflammation and adhesions in the pelvis can distort or block the fallopian tubes, preventing eggs from travelling to the uterus to be fertilised. This is one of the more direct mechanical effects of the disease.
Ovarian endometriomas. When endometrial tissue implants on the ovaries, it can form cysts that fill with old blood over time, sometimes called "chocolate cysts" because of their dark contents. Endometriomas don't just sit there passively. They sit within the ovarian tissue itself, and over time, the chronic inflammation they cause can damage the healthy egg-containing tissue around them. This directly affects ovarian reserve, the number of eggs you have available.
The inflammatory environment. Even without structural damage, the chronic inflammation associated with endometriosis creates a hostile environment for egg development and fertilisation. Research suggests the quality of eggs in women with endometriosis can be affected by this sustained inflammatory state, even in women whose tubes are clear and whose AMH appears normal.
Hormonal disruption. Endometriosis is an oestrogen-dependent condition, meaning oestrogen drives its growth. The elevated oestrogen environment associated with endometriosis can disrupt ovulation and affect cycle regularity.
None of this means difficulty conceiving is inevitable. Many women with endometriosis conceive naturally. Many others conceive with relatively straightforward support. But the disease does introduce variables that are worth understanding and planning around, particularly because they tend to worsen over time if the disease progresses.
This part deserves its own section, because it's a decision many women make without fully understanding the implications.
If you have an endometrioma, a cyst on your ovary, your gynaecologist may recommend surgical removal (called a cystectomy). The surgery can relieve pain and is sometimes necessary. But here's what often doesn't get communicated clearly: removing an endometrioma means removing some of the surrounding ovarian tissue along with it, because the cyst wall is embedded within it.
That means surgery to treat endometriosis can itself reduce your ovarian reserve.
This isn't a reason to avoid surgery when it's needed. It's a reason to have a specific conversation with a fertility specialist before making that decision, particularly if you haven't yet considered your options for fertility preservation.
Freezing your eggs before surgical treatment means your reserve goes into storage at its current level, before the procedure reduces it further. For women with endometriomas who are thinking about future children, this sequencing matters. It's not information most women get unless they specifically seek out a fertility specialist rather than only seeing a gynaecologist.
A few things are worth doing, and the earlier the better.
Get your AMH tested. AMH gives you a snapshot of your current ovarian reserve. If you have endometriosis, especially if you have endometriomas, knowing your baseline is essential. It tells you whether your reserve has already been affected, and it gives you a reference point to track against.
Talk to a fertility specialist, not only a gynaecologist. This isn't a criticism of gynaecologists. It's about scope. A fertility specialist is trained to assess what endometriosis means for your reproductive options and timeline. That conversation is different from a pain management conversation, and it should happen alongside it.
Consider preservation before it becomes urgent. If you're not yet ready to conceive but you know endometriosis is part of your picture, egg or embryo freezing is worth a serious conversation. The disease tends to progress. Surgical treatment can affect reserve. The eggs you have today are more than the eggs you may have in three years.
You don't have to be in crisis to have this conversation. The value of having it early is precisely that you're not.
If you've been diagnosed with endometriosis, or if you have symptoms that haven't been fully explained, we can run a baseline fertility assessment that includes AMH, a hormone panel, and an ultrasound to check your ovaries and follicle count. From there, you'll have a clear picture of where your reserve stands right now, and a genuine conversation about what your options look like before any treatment decisions are made.
If you're moving toward surgical treatment, it's worth having this conversation first.
Does endometriosis always affect fertility? No. Many women with endometriosis conceive naturally, and many others conceive with support. The disease introduces variables that affect fertility, scarring, inflammation, ovarian reserve, but it doesn't make conceiving impossible. What it does make is the case for understanding where you stand sooner rather than later.
Can endometriosis affect my AMH (egg reserve)? Yes, particularly if you have endometriomas on your ovaries. The chronic inflammation from cysts sitting within ovarian tissue can reduce the healthy tissue around them over time. AMH testing tells you your current reserve. For women with endometriosis, this number is worth knowing.
Should I freeze my eggs if I have endometriosis? It's worth a serious conversation with a fertility specialist, particularly if you have endometriomas or are considering surgical treatment that could affect your reserve. Preservation before disease progression or surgery gives you options that are harder to access afterwards.
If I have the surgery to remove an endometrioma, will it affect my fertility? Endometrioma removal (cystectomy) typically requires removing some surrounding ovarian tissue along with the cyst, which can reduce ovarian reserve. This doesn't mean the surgery is wrong. Sometimes it's necessary. It means the decision should involve a fertility specialist alongside your gynaecologist, particularly if children are in your future plans.
What's the difference between endometriosis and adenomyosis? Endometriosis involves tissue growing outside the uterus. Adenomyosis involves similar tissue growing into the muscular wall of the uterus itself. The two conditions frequently co-exist. Adenomyosis is a common cause of heavy, cramping periods and can also affect implantation. If you've been diagnosed with one, it's worth asking your doctor to assess for the other.
The Pearl Journal is an editorial publication from Pearl by Zoi Fertility. Content is for informational purposes and does not constitute medical advice. For personalised guidance, book a consultation with our clinical team.
