Could air pollution influence endometriosis? Experimental research raises questions about inflammation, but does not prove a cause of individual infertility.
Air Pollution and Endometriosis
Endometriosis remains a “disease discovered too late.” While it is a common condition affecting 10–15% of women of reproductive age, it takes an average of five to ten years to reach a definitive diagnosis.
This gap is not merely a matter of healthcare accessibility. More fundamentally, it stems from the fact that this disease manifests as “pain disguised as normalcy.” Most women endure menstrual cramps, but the problem lies in the lack of awareness that such pain may be a signal of a deeper pathology. Pelvic pain, cramps, and chronic fatigue are so common that they are rarely questioned. The disease buys time through this very complacency. During this interval, endometrial tissue spreads outside the uterus, silently growing, fueling inflammation, and causing adhesions. By the time it is finally discovered, many patients are already in a state where achieving pregnancy has become increasingly difficult.
This leads us to a pivotal question: Why is endometriosis increasing, and why is it being detected later than ever?
In Korea, the number of patients has surged by approximately 50% over the past five years. The reported increase alone cannot separate changing disease prevalence from changes in diagnosis or healthcare use. While traditional explanations—retrograde menstruation, immune dysfunction, and genetic factors—are valid, the clinical reality is changing faster than these theories can explain.
The variable we must now scrutinize is the “environment,” specifically fine dust.
Fine dust is no longer just a respiratory issue. Fine particulate matter (PM2.5) enters the bloodstream, affecting the entire body. The uterus is no exception. Experimental research explores a possible mechanism: cells repeatedly exposed to fine particulate matter initially suffer damage, but over time, they undergo a pathological transformation, becoming more aggressive, proliferative, and resistant to cell death. It creates an environment where “pathological cells” are favored and selected.
Animal studies mirror this trend. Subjects exposed to fine particulate matter exhibit larger endometriosis lesions, increased inflammation, and decreased cell apoptosis. Combined with changes in estrogen receptors, this suggests that the environment is not just a passive irritant, but an active catalyst that fuels the disease.
When we apply these findings to the field of fertility, the implications become clearer. Repeated implantation failure without an identifiable cause, unexplained chronic inflammation, and recurrent lesions after surgery—factors once attributed to “luck” or “constitutional disposition”—are now being redefined. Environmental mechanisms remain a research question; these experiments do not explain individual cases of implantation failure.
This leads to a sobering question: How free are we from this risk?
The answer is cold: nearly everyone is exposed. Through the daily commute, indoor air quality, poorly ventilated spaces, and seasonal surges in high-concentration fine dust, endometriosis is evolving from a condition affecting specific individuals into an increasingly common disease within the modern urban landscape.
However, the key here is not fear, but “interpretation.”
Addressing this disease is not just about medical treatment; it requires a strategy to reduce exposure. Minimizing outdoor activities on days with high fine dust levels, wearing protective masks when necessary, immediate cleansing upon returning home, and maintaining indoor air quality through brief, frequent ventilation—these may seem trivial, but they may reduce exposure, but have not been established as fertility treatments.
The core message of this article is simple: The uterus is more vulnerable to the external environment than we previously thought.
We have long explained pregnancy solely through the lens of age and hormones. Now, we must change our questions. We must ask, “What kind of air am I living in?”
This research question sits alongside the need for timely diagnosis and individualized clinical care.
Disclaimer: This content is provided by a fertility specialist journalist based on the collection and analysis of domestic and international reproductive medicine research, policy materials, and statistical data. Medical judgments and treatment decisions must always be made in consultation with professional medical personnel. Image: AI-generated (ChatGPT, OpenAI) / Visual reference for illustrative purposes only.
Evidence and interpretation
The primary study, Effects of chronic particulate matter exposure on endometriosis-associated signaling pathways and disease progression, appeared in Molecular Human Reproduction in 2025 (DOI: 10.1093/molehr/gaaf013). These experimental findings do not quantify an individual woman’s infertility risk or prove that pollution explains rising diagnosis rates.
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