From Gut to Gamete: What the Microbiome May Mean for Fertility in Endometriosis and Adenomyosis
What current science says about the microbiome’s role in fertility for those with endometriosis or adenomyosis—plus realistic, patient‑centered steps you can take now.
For people living with endometriosis or adenomyosis, fertility concerns often feel layered and complex. Hormones, inflammation, pain, prior surgeries, medications, and immune dysfunction can all intersect—sometimes in ways that are difficult to fully explain. A growing area of research suggests that another system may also be part of this picture: the microbiome, the community of microbes living in and on the body.
A 2025 review published in Microbiome explores how microbial communities—particularly in the gut and reproductive tract—may influence fertility and preconception health. Importantly, the authors emphasize caution: much of the evidence is still early, and while associations are compelling, cause‑and‑effect relationships in humans have not yet been proven. For patients with endometriosis or adenomyosis, this research offers context rather than promises—but it may help explain why whole‑body approaches to care matter.
What is the microbiome—and why might it matter in endometriosis and adenomyosis?
The microbiome refers to trillions of bacteria, viruses, and fungi that live primarily in the gut, but also in the reproductive tract, skin, and other tissues. These microbes are not passive passengers. They actively produce metabolites and signaling molecules that influence:
- Immune regulation and inflammation
- Estrogen metabolism and hormonal balance
- Energy use and metabolic health
For patients with endometriosis or adenomyosis—conditions strongly linked to chronic inflammation, immune dysregulation, and estrogen‑dependent pathways—these microbiome‑mediated processes are particularly relevant. The review suggests that microbial signals may influence reproductive tissues during the preconception period, potentially affecting ovulation, implantation, and early pregnancy physiology.
That said, the authors stress that researchers do not yet have a complete mechanistic map showing exactly how microbial signals travel from the gut to the ovaries, uterus, or endometriotic lesions in humans. This remains an active area of investigation.
Distinct microbiome patterns have been observed in endometriosis
The review summarizes evidence that people with certain reproductive conditions may have distinct microbiome “signatures,” including those with:
- Endometriosis
- Polycystic ovary syndrome (PCOS)
- Primary ovarian insufficiency
- Recurrent pregnancy loss
For endometriosis patients, this aligns with earlier research suggesting alterations in both gut and reproductive‑tract microbiota. However, it is critical to interpret this carefully. A different microbiome does not mean the microbiome caused endometriosis or adenomyosis. Instead, it suggests that these conditions may be associated with systemic changes—including immune and inflammatory shifts—that also affect microbial ecosystems.
In other words, the microbiome may be part of the broader biological environment in which endometriosis exists, rather than a single root cause.
What animal studies suggest—and why human relevance is still uncertain
Much of the mechanistic insight in this field comes from animal models. The review highlights studies showing that disrupting the gut microbiome in animals can accelerate ovarian aging and impair reproductive function.
These findings are biologically intriguing, especially for patients concerned about diminished ovarian reserve or early fertility decline. However, the authors repeatedly caution against over‑extrapolating these results. Key limitations include:
- Animal reproductive physiology differs from humans
- Microbiome manipulations in animals are often extreme and artificial
- Fecal microbiota transplantation (FMT) studies in mice do not prove human causality
For patients, this means that while headlines about “fixing fertility by fixing the gut” may sound appealing, they often oversimplify what the science actually shows.
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Schedule Your ConsultDiet: a practical lever that may matter more than supplements
One of the most relevant takeaways for patients with endometriosis or adenomyosis is the role of diet. According to the review, diet is the most direct and modifiable factor shaping microbiome composition and function.
Key points include:
- Dietary patterns can shift the microbiome within days
- High‑fiber diets support production of beneficial metabolites such as short‑chain fatty acids (SCFAs)
- Western‑style diets (high in ultra‑processed foods and saturated fats, low in fiber) are associated with microbiome disruption and reduced beneficial metabolites
Because inflammation plays a central role in endometriosis, these dietary effects may be particularly relevant—even though direct fertility benefits have not yet been proven in clinical trials.
Patient‑centered takeaway
Rather than focusing on calories or restrictive rules, the review supports emphasizing diet quality, especially in the months leading up to conception. For many patients, this may overlap with dietary strategies already used to help manage endometriosis‑related inflammation and gastrointestinal symptoms.
Antibiotics and preconception planning: why history matters
The review also discusses how broad‑spectrum antibiotics can significantly disrupt the gut microbiome and reduce microbial diversity. Some human studies have linked preconception antibiotic exposure with outcomes such as:
- Interactions with hormonal contraceptives
- Increased risk of infertility
- Miscarriage
- Certain congenital anomalies
The authors do not recommend avoiding antibiotics when medically necessary. Instead, they emphasize thoughtful use and awareness—especially for patients who have required repeated antibiotic courses, which is not uncommon in people with chronic pelvic pain or recurrent infections.
Patient‑centered takeaway
If you have endometriosis or adenomyosis and are considering pregnancy:
- Share your recent antibiotic history with your clinician
- Let your care team know if you are trying to conceive or plan to soon
- Ask whether timing or antibiotic choice matters in your specific situation
Do probiotics or microbiome treatments improve fertility in endometriosis?
At present, there is no strong evidence that probiotics or microbiome‑targeted treatments improve fertility outcomes, including IVF success. The review notes that in studied examples, microbiome interventions did not outperform placebo in reproductive endpoints.
This is especially important for endometriosis patients, who are often targeted by supplements and programs promising to “heal the gut to restore fertility.” While the biology is intriguing, the clinical data are not yet there.
Patient‑centered takeaway
If you are considering probiotics or microbiome‑focused fertility products:
- Be cautious of strong marketing claims
- Review ingredients with your clinician
- Prioritize interventions with clearer evidence while research continues
What you can reasonably do now—without overpromising
Based on this review, these steps are considered low‑risk and reasonable to discuss with your care team:
- Begin preconception planning early, including medication and nutrition review
- Emphasize fiber‑rich, minimally processed foods to support a healthier microbiome profile
- Limit ultra‑processed dietary patterns associated with microbiome disruption
- Review antibiotic history as part of fertility planning
- Approach microbiome “fixes” with healthy skepticism
These steps align with broader principles of endometriosis‑informed care, even as fertility‑specific microbiome research continues to evolve.
The bottom line for endometriosis and adenomyosis patients
The microbiome may represent one of the missing links connecting diet, immune balance, hormones, inflammation, and reproductive health—all areas deeply relevant to endometriosis and adenomyosis. The 2025 Microbiome review presents a thoughtful, measured message:
- Associations and animal data are compelling
- Human causality and effective treatments are not yet established
- Practical focus should remain on evidence‑based care, diet quality, and informed medication use
For patients, this research does not offer a quick fix—but it reinforces the importance of whole‑body, personalized approaches to fertility and reproductive health.
References
Munyoki SK, Vukmer N, Rios JM, Kallen A, Jašarević E. From gut to gamete: how the microbiome influences fertility and preconception health. Microbiome. 2025. (Review/Commentary). DOI: 10.1186/s40168-025-02230-7
Quick Answers
When is hysterectomy recommended for adenomyosis?
A hysterectomy is typically considered for adenomyosis when symptoms are severe and clearly uterus-driven—most often heavy bleeding (sometimes with anemia), intense cramping, pelvic pressure, and daily quality-of-life disruption—and you’re not planning future pregnancy. It’s the most definitive option because adenomyosis lives within the uterine muscle, so removing the uterus removes the source of the problem.
In practice, we usually weigh hysterectomy most strongly when conservative options haven’t brought acceptable relief, aren’t tolerated, or don’t fit your goals. The decision also depends on the pattern and extent of disease (diffuse adenomyosis versus a more focal adenomyoma that may be removable while preserving the uterus) and whether endometriosis may also be present. If endometriosis is part of the picture, it’s important to know that hysterectomy alone doesn’t treat disease outside the uterus—durable symptom relief depends on addressing all pain generators.
If you’re wondering whether you’re at the point where hysterectomy makes sense, our team can help clarify what’s most likely driving your symptoms, review imaging, and walk you through uterus-preserving versus definitive surgical paths so you can choose the option that best matches your relief and fertility priorities.
Which adenomyosis symptoms most affect daily life?
Adenomyosis symptoms that most disrupt quality of life usually come from two main issues: how the uterus bleeds and how it hurts. Many patients describe heavy or prolonged periods that interfere with work, school, travel, and sleep—sometimes with flooding, frequent pad/tampon changes, and fatigue that can follow significant blood loss. Severe period pain (often more than “normal cramps”) is also common, and it can feel deep, aching, or pressure-like, sometimes accompanied by an enlarged, tender uterus and a sense of pelvic heaviness or bloating.
Outside of the period itself, adenomyosis can contribute to chronic pelvic pain, pain with sex for some people, and bowel or bladder discomfort—especially when symptoms flare around the menstrual cycle. It can also overlap with endometriosis, and when both are present symptoms may intensify or become harder to tease apart. If your day-to-day life is being shaped by bleeding, pain, pressure, or fertility stress, our team can help you sort out whether adenomyosis, endometriosis, fibroids, or more than one condition may be driving the pattern—and what next-step options make sense for your goals.
Why does ovarian cyst pain keep coming back?
Ovarian cyst pain can feel “recurrent” for a few different reasons. Some cysts are functional (they form with ovulation and then resolve), so the pain returns in a similar spot month after month even though it’s not the exact same cyst. In other cases, the cyst itself can come back or persist—especially if it’s an endometrioma (an ovarian cyst caused by endometriosis), which can behave differently than a simple cyst and may be associated with deeper pelvic disease.
Another common reason is that the cyst isn’t the whole story: endometriosis on the pelvic sidewall, uterosacral ligaments, bowel, bladder, or around the ovary can irritate the same nerves and tissues and make it feel like “my cyst is back” when the driver is actually inflammatory disease nearby. Adhesions (scar-like bands) can also tether the ovary and cause recurring pulling or sharp pain, even when imaging doesn’t show a large cyst. If your pain cycles, escalates, returns quickly after a “normal” ultrasound, or keeps recurring despite prior treatment, our team can help you map the pattern, interpret imaging with an endometriosis lens, and decide whether targeted evaluation and—when appropriate—excision surgery is the next best step.
Can endometriosis cause infertility and pelvic pain in your 20s?
Yes. Endometriosis can absolutely show up in your late 20s and it can be a driver of both chronic pelvic pain and fertility challenges. Pain can include severe or worsening period cramps, pain with sex, bowel or bladder pain, and “flare” patterns that track with your cycle—although symptom severity doesn’t always match how much disease is present.
Endometriosis can affect fertility in several ways, including adhesions that distort tubo‑ovarian anatomy, inflammation and immune signaling that interferes with fertilization or embryo development, and ovarian factors—especially when endometriomas are involved. For some patients, the uterine environment also matters, particularly when adenomyosis is present alongside endometriosis. In our practice, we focus on listening to your full symptom and fertility story and then building an evaluation that looks for endometriosis while also checking for common look‑alikes or coexisting issues, so we can tailor a plan to your goals—whether that’s pain relief, preserving fertility, or both.
Why do I have chronic fatigue and pelvic pain?
Chronic fatigue plus pelvic pain often feels “unexplainable” because it’s rarely caused by just one issue—and many of the most common drivers don’t show up on routine labs or a quick ultrasound. Endometriosis and adenomyosis can cause persistent pelvic pain, painful periods, bowel/bladder symptoms, and deep fatigue through inflammation, disrupted sleep, heavy bleeding (and possible iron deficiency), and the sheer energy cost of living with ongoing pain. It’s also common for more than one gynecologic condition to coexist—like fibroids, polyps, or benign cysts—so a single label may not fully match what you’re experiencing.
Another reason symptoms can persist is that the nervous system can become more pain-sensitive over time (often called central sensitization), meaning pain can spread, linger outside your cycle, or feel disproportionate to what imaging shows. In those cases, symptom relief alone can miss the bigger picture: we think in terms of both treating disease (for example, addressing endometriosis lesions or uterine drivers like adenomyosis/fibroids) and building a personalized pain-management plan so your body can “turn down the volume” on pain signals.
If your fatigue and pelvic pain have been brushed off or left without a clear plan, our team can help you sort through the likely contributors, including endometriosis/adenomyosis and common coexisting conditions, and map next steps that fit your goals. You can explore our educational resources on fatigue, chronic pelvic pain, and comprehensive treatment approaches, and reach out to schedule a consultation when you’re ready.