Endometriosis is a chronic condition in which tissue similar to the uterine lining grows outside the uterus — on the ovaries, fallopian tubes, peritoneum, and sometimes beyond. It affects an estimated 10% of reproductive-age women globally, and for many, it goes undiagnosed for years. For women over 35 who are navigating fertility concerns or unexplained pelvic symptoms, understanding what endometriosis is and how it may be relevant is worth knowing.
This article explores what current research indicates about endometriosis, how it relates to fertility after 35, what symptom patterns may prompt investigation, and what management approaches are available. Individual experiences with endometriosis vary enormously — some women have severe symptoms and significant fertility effects; others have minimal symptoms and conceive without difficulty.
For related reading on fertility assessment, our article on AMH levels and ovarian reserve after 35 provides useful complementary information.
What Research Shows About Endometriosis and Prevalence
According to the American College of Obstetricians and Gynecologists (ACOG), endometriosis affects approximately 10–15% of women of reproductive age. Among women with infertility, prevalence is estimated to be significantly higher — around 25–50%. The condition is more commonly diagnosed in women in their 30s and 40s, partly because it often takes years from symptom onset to diagnosis, and partly because many women don’t seek investigation until they’re trying to conceive.
The mechanisms by which endometriosis affects fertility are complex and not fully understood. Research suggests several potential pathways, including physical obstruction of fallopian tubes, impact on egg quality (possibly via inflammatory markers in the pelvic environment), effects on the uterine lining, and hormonal disruptions.
Recognizing Symptoms That May Warrant Investigation
Endometriosis is famously variable in its presentation. Some women have severe pain and abnormal findings; others have no symptoms but are diagnosed incidentally or only when investigating infertility. The most commonly reported symptoms include:
Pelvic Pain
Pelvic pain — particularly pain that correlates with the menstrual cycle — is the most frequently reported symptom. This can include severe or worsening menstrual cramps (dysmenorrhea), pelvic pain outside of menstruation, and pain with ovulation. Research suggests that painful periods in adolescence or early adulthood are often an early indicator of endometriosis that goes unrecognized for years.
Pain With Intercourse
Deep dyspareunia (pain with deep penetration during sex) is reported by many women with endometriosis, particularly when endometriosis involves the ovaries or uterosacral ligaments. This symptom is often undertreated and under-reported; if you experience it, raising it with your healthcare provider is important.
Other Symptoms
Depending on the location of endometriosis lesions, symptoms can include painful bowel movements or urination (particularly during menstruation), bloating, and fatigue. These symptoms overlap with other conditions (IBS, bladder disorders, fibroids), which contributes to the diagnostic delay that many women experience.
Diagnosis: Why It Often Takes So Long
The only definitive way to diagnose endometriosis is through laparoscopic surgery with tissue biopsy, though ultrasound and MRI can identify endometriomas (ovarian cysts caused by endometriosis) and, in experienced hands, deep endometriosis lesions. The average diagnostic delay from symptom onset to diagnosis has historically been seven to ten years — a figure that many advocates and researchers are working to reduce through better awareness and clinical recognition.
For women over 35 who have had pelvic symptoms for years without a clear diagnosis, or who are experiencing unexplained infertility, discussing the possibility of endometriosis with their gynecologist or a specialist is reasonable. A detailed symptom history and targeted imaging can help direct next steps.
Endometriosis and Fertility After 35
The relationship between endometriosis and fertility is not binary. Many women with endometriosis conceive naturally, particularly with milder stages of the disease (Stage I and II). More advanced endometriosis (Stage III and IV, including endometriomas and adhesions affecting the tubes and ovaries) is associated with greater fertility impact. Age compounds this, as ovarian reserve may already be affected by the condition — some research suggests endometriomas can reduce ovarian reserve over time and with surgical treatment.
Management decisions in the context of fertility after 35 may involve weighing the potential benefits of surgical intervention (removing endometriosis tissue) against the risk of inadvertently reducing ovarian reserve. These decisions are highly individualized and benefit from consultation with a reproductive endocrinologist who has expertise in endometriosis. Our article on when to see a fertility specialist may be a useful resource for understanding when specialist care is most appropriate.
Management Approaches
Management of endometriosis depends on whether the primary goal is symptom relief, fertility, or both. Medical management (hormonal therapies that suppress the menstrual cycle) can effectively reduce pain symptoms but is not compatible with trying to conceive. Surgical management (laparoscopic excision or ablation of lesions) can reduce pain and, in some cases, improve fertility — though benefits for fertility are not universal, and the evidence is stronger for some stages than others. For women pursuing assisted reproduction, IVF may be recommended depending on the clinical picture and extent of disease.
Frequently Asked Questions
Can endometriosis develop after 35, or is it only something younger women get?
Endometriosis is a condition that develops during the reproductive years and is typically diagnosed in women in their 30s and 40s — not because it starts later, but because diagnosis often follows years of symptoms. It doesn’t “develop” for the first time after 35 per se, but many women receive their diagnosis in this age range. After menopause, endometriosis typically becomes less active as estrogen levels decline.
Does endometriosis always cause infertility?
No. Many women with endometriosis conceive without difficulty. Fertility impact is more closely associated with the stage and location of disease, the effect on ovarian reserve, and tubal involvement, among other factors. Individual fertility outcomes vary considerably, and it’s not possible to predict from a diagnosis alone what your specific fertility picture looks like. A reproductive endocrinologist can offer a more tailored assessment.
Should I have surgery for endometriosis to improve my chances of conceiving?
Whether surgical treatment improves natural conception rates is a nuanced question that depends on the type and stage of endometriosis, your age, ovarian reserve, and how long you’ve been trying to conceive. Evidence supports surgery for certain types (notably for Stage III/IV endometriosis and endometriomas), but evidence for milder disease is less consistent, and surgery carries its own risks — including to ovarian reserve. This decision benefits from specialist input specific to your situation.
Can I manage endometriosis symptoms without surgery?
Yes. Hormonal therapies — including birth control pills, progestins, GnRH agonists or antagonists, and others — are effective at reducing endometriosis-related pain for many women. Non-hormonal pain management strategies may also play a role. These approaches don’t eliminate or treat the underlying lesions, but they can significantly improve quality of life. Discussing the options with your gynecologist in the context of your overall goals (including fertility plans) can help identify the most appropriate approach.
Key Takeaways
- Endometriosis affects approximately 10–15% of reproductive-age women and is more commonly diagnosed in the 30s and 40s, often after years of unrecognized symptoms.
- Fertility impact varies considerably with stage and location of disease; many women with endometriosis conceive naturally, while others benefit from specialist support.
- Diagnostic delay is common — if you’ve had unexplained pelvic symptoms or infertility, discussing the possibility of endometriosis with your provider is a reasonable step.
- Management decisions — particularly around surgery in the context of fertility after 35 — are highly individualized and benefit from consultation with a reproductive endocrinologist experienced in endometriosis.
Medical Disclaimer
This content is for informational purposes only and does not constitute medical advice. Individual health situations vary significantly. Always consult a qualified healthcare provider before making decisions related to your health, fertility, or pregnancy.
About the Author
Emily Carter is a women’s health writer focused on fertility, pregnancy after 35, and sleep changes in midlife. She writes research-informed, non-alarmist content to help women navigate reproductive and hormonal transitions with clarity and confidence.