The key finding
This 2025 comprehensive review reveals that endometriosis—a condition affecting approximately 10% of women of reproductive age—is associated with measurable alterations in the gut microbiota, endometrial microbiota, and vaginal microbiome. Researchers now recognize endometriosis not merely as a localized gynecological issue but as a systemic, immune-mediated condition with potential bidirectional relationships between microbial communities and disease progression. The review synthesizes evidence from both animal and human studies showing that women with endometriosis exhibit distinct bacterial profiles in multiple body sites, opening new avenues for understanding why digestive symptoms frequently accompany this painful condition.
What the study looked like
This narrative review synthesized current research on endometriosis and microbiota from both animal models and human clinical studies. Rather than presenting original data, the authors compiled findings from multiple research streams investigating gut microbiota composition, endometrial bacterial communities, and vaginal microbiome profiles in women with endometriosis compared to healthy controls. The review examined studies exploring the pathophysiology of endometriosis—where endometrial-like tissue grows outside the uterine cavity causing chronic pelvic pain and infertility—alongside emerging evidence about immune dysregulation and microbial alterations. The authors specifically focused on understanding why many women with endometriosis experience digestive symptoms and how bacterial communities in different body compartments might interconnect with disease mechanisms.
Why researchers think this happened
The researchers propose that endometriosis involves profound immune dysregulation that may interact bidirectionally with microbiota changes. This means the altered bacterial communities could potentially influence immune responses, while the immune dysfunction characteristic of endometriosis might simultaneously shape which microbes thrive in the gut and reproductive tract. The frequent digestive symptoms reported by patients—previously considered coincidental—may reflect genuine gut microbiota disturbances linked to the systemic nature of the disease. The endometrial microbiota has emerged as particularly relevant because it represents an early point of contact in disease development and shows strong connections with the vaginal microbiome. The authors suggest these microbial alterations aren’t merely byproducts of disease but may represent integral components of endometriosis’s multifactorial origins, potentially contributing to inflammation, immune activation, or tissue changes.
How to read this carefully
As a narrative review rather than an original study, this paper summarizes existing research without presenting new experimental data, meaning its conclusions depend on the quality and design of the underlying studies it references. The precise causal relationships between microbiota changes and endometriosis remain unclear—we cannot yet determine whether bacterial alterations contribute to disease development, result from the condition, or both. Many microbiome studies involve relatively small sample sizes and show associations rather than causation. Additionally, microbiota research faces inherent challenges: bacterial communities vary widely between individuals, can be influenced by diet and medications, and differ based on collection methods. The field of endometrial microbiota research is particularly new, so findings require replication across larger, diverse populations before drawing firm conclusions.
What this means for everyday life
For the estimated 10% of women experiencing endometriosis, this research offers validation that their digestive symptoms may genuinely connect to their condition rather than being separate issues. Understanding endometriosis as a systemic disease with immune and microbial components might eventually influence how doctors approach diagnosis and treatment, though microbiota-targeted therapies remain investigational. Women with endometriosis experiencing gut symptoms might find it worthwhile to discuss these connections with healthcare providers, though current standard treatments remain focused on hormonal management and surgery. The research suggests future management strategies could potentially incorporate microbiota considerations, but readers should be cautious about unproven probiotic claims targeting endometriosis until rigorous clinical trials demonstrate benefit. For now, this evolving understanding reinforces that endometriosis involves complex body-wide interactions deserving comprehensive, multidisciplinary care approaches.