Endometriosis is usually talked about as a pelvic pain and fertility problem. A massive new study suggests it may be tied to something far beyond the reproductive system: blood sugar. Researchers tracking nearly 3 million women found a clear link between endometriosis and type 2 diabetes, with a 46% higher risk among women who had the condition.
The twist that has doctors paying attention? The link was strongest in women who don’t fit the typical diabetes profile — younger, premenopausal women and women without obesity. Here’s what the study found, what it doesn’t prove, and what you can actually do with this information.
The Study Linking Endometriosis and Type 2 Diabetes
The research was led by George Mason University’s College of Public Health and published Aug. 6, 2026, in the journal Diabetologia. It’s part of the Advancing Research on Cardiovascular Health and Endometriosis Study, or ARCHES.
According to George Mason’s announcement, it is the largest study to date examining the relationship between the two conditions. Doctoral student Maggie Fuzak Nunziato led the work with Anna Pollack, a professor of Global and Community Health.
Collaborators came from the University of Utah, the University of Arizona, Brigham and Women’s Hospital and Intermountain Health.
By the numbers
- 2,939,364 women in the Utah Population Database, per AJMC’s review of the paper
- 99,978 of them had an endometriosis diagnosis
- 1996–2021: the years covered by the data
- 10.8 years: average follow-up per person
- 46%: higher risk of type 2 diabetes in women with endometriosis (adjusted hazard ratio 1.46)
The researchers adjusted for birth year, birth state, race and ethnicity, age and baseline body mass index (BMI). That means the 46% figure isn’t simply explained by those factors.
Who Had the Highest Risk?
This is where the study gets interesting. Earlier research had mostly treated endometriosis as one condition and generally found little or no overall link to diabetes, Fuzak Nunziato said. This team broke it down by subtype and by patient group — and the picture changed.
Endometriosis outside the pelvis
The strongest link showed up in extra-pelvic endometriosis, meaning the disease is found outside the pelvis. According to AJMC’s summary of the paper, the “other site” categories carried hazard ratios of roughly 2.5 to 2.7.
Other forms were also linked to higher risk, including superficial peritoneal disease (1.67), ovarian endometriosis (1.61), deep infiltrating endometriosis (1.45) and adenomyosis (1.34).
One important caveat, flagged by the authors themselves: the “other site” categories are the least anatomically specific and most prone to coding variability. The biggest numbers are also the least precise.
Premenopausal women and women without obesity
Premenopausal women with endometriosis had a notably higher risk than postmenopausal women (hazard ratio 1.55 vs. 1.07). And the association was larger in women with a BMI under 30 than in women with obesity (2.39 vs. 1.74 in that analysis).
That’s the reverse of what most people assume about diabetes. It also means these women might not be flagged as “high risk” during routine checkups. A history of gestational diabetes didn’t explain the pattern either, per AJMC.
What Is Endometriosis?
According to the World Health Organization’s endometriosis fact sheet, endometriosis affects an estimated 10% of reproductive-age women worldwide — about 190 million people. It happens when tissue similar to the lining of the uterus grows outside the uterus, causing inflammation and scar tissue.
Common symptoms include severe period pain, heavy menstrual bleeding, chronic pelvic pain, infertility, bloating and nausea. It most often occurs in the pelvis, but it can show up elsewhere in the body, including the abdomen and chest.
There’s no known cure. Diagnosis is notoriously slow: the WHO says the average time to diagnosis is between 4 and 12 years.
Why Would Endometriosis and Type 2 Diabetes Be Connected?
Short answer: nobody knows for sure yet. The researchers are clear that more work is needed to understand the biology. But they point to a few hypotheses worth understanding.
Hypothesis 1: Chronic inflammation
Endometriosis is an inflammatory condition. The George Mason team believes chronic inflammation associated with endometriosis may play a role in metabolic health. Inflammation is known to be involved in insulin resistance, the main driver of type 2 diabetes — but a direct pathway in endometriosis hasn’t been proven.
Hypothesis 2: Hormones during the reproductive years
The paper describes endometriosis as a “hormonally responsive condition” with heightened inflammatory activity during the reproductive years, per AJMC. That could help explain why the link was stronger before menopause.
Hypothesis 3: A bigger share of risk in lean women
For women without obesity, the authors suggest endometriosis-related inflammation may be a larger contributor to metabolic problems than it is for women who already carry other risk factors. Again, that’s a hypothesis — not a finding.
Association, Not Causation: The Study’s Limits
This is the most important section of this article. The study shows an association between endometriosis and type 2 diabetes. It does not prove that endometriosis causes diabetes. The researchers themselves emphasize this point.
Here are the key limitations to keep in mind:
- It’s retrospective. The team looked back at existing records rather than following women forward in a controlled trial.
- It’s one state’s population. The data came from Utah, which may not reflect the diversity of the whole U.S.
- Diagnosis came from billing codes. Endometriosis was identified through ICD codes, not surgical confirmation, and coding was less sensitive for deep infiltrating disease.
- Possible surveillance bias. Women with endometriosis tend to see doctors more often, so diabetes might simply be caught more often.
- Missing lifestyle data. Diet, physical activity and hormonal treatments weren’t measured.
- Confirmed cases showed a lower estimate. When the analysis was restricted to laparoscopy-confirmed cases, the risk estimate dropped.
The authors did test how strong a hidden factor would need to be to erase the finding. Their analysis showed an unmeasured confounder would need at least a 2.28-fold association with both conditions to fully explain the results. You can read the full paper in Diabetologia.
What to Do If You Have Endometriosis
This is not a reason to panic. It’s a reason to add one more topic to your next appointment. If the findings hold up, the researchers say, clinicians could use endometriosis as a signal for earlier diabetes screening or prevention.
Ask about blood sugar screening
Common tests include a fasting plasma glucose test and the A1C test, which reflects average blood sugar over about three months. Under the American Diabetes Association’s Standards of Care, an A1C of 5.7% to 6.4% indicates prediabetes, and 6.5% or higher is in the diabetes range.
The ADA recommends screening for all adults starting at age 35, with earlier testing for people with risk factors. Whether endometriosis should count as one of those risk factors is exactly the question this research raises — so ask your clinician whether earlier or more frequent testing makes sense for you.
Know the warning signs of type 2 diabetes
Type 2 diabetes can develop slowly and quietly. Common symptoms, per the CDC and the American Diabetes Association, include:
- Urinating often, especially at night
- Feeling very thirsty or very hungry
- Blurry vision
- Cuts or sores that heal slowly
- Numbness or tingling in the hands or feet
- Unusual tiredness
Many people have no symptoms at all early on, which is why screening matters.
Stick with the basics
The fundamentals — regular movement, sleep, a balanced diet and not smoking — support metabolic health for everyone. Our look at why longevity basics beat biohacks explains why the boring stuff still wins.
Talk to your doctor or gynecologist before making any changes to your treatment, medications or health routine. Hormonal and other endometriosis therapies are individual decisions, and nothing in this study suggests stopping or switching them on your own.
The Bigger Picture for Women’s Health
This study adds to a growing body of research showing that conditions long treated as “women’s issues” may have whole-body effects. “Our findings add to a growing understanding that endometriosis may affect more than reproductive health alone,” Fuzak Nunziato said.
It’s also part of a wider trend of researchers finding surprising links between conditions — like our recent coverage of a study on semaglutide and asthma attacks. Each one is a reminder that the body doesn’t work in separate compartments.
The Bottom Line
A large Utah-based study found that women with endometriosis had a 46% higher risk of developing type 2 diabetes, with the strongest links in premenopausal women, women without obesity and those with endometriosis outside the pelvis. It’s an association, not proof of cause, and it needs to be confirmed in other populations.
If you have endometriosis, the practical move is simple: ask your clinician whether blood sugar screening makes sense for you, and learn the warning signs. For more clear, science-backed health news, stay with USA One News.
