Endometriosis tied to 46% higher type 2 diabetes risk

Endometriosis and diabetes risk: what the study found

Women with endometriosis had a 46% higher risk of developing type 2 diabetes than women without endometriosis in a large new study.

The research was led by investigators at the George Mason College of Public Health and collaborators and was published in Diabetologia. It followed data from nearly 3 million women over 25 years and is described as the largest study to date on this relationship.

• Reported association: 46% higher risk of type 2 diabetes in women with endometriosis vs without
• Scale and timeline: nearly 3 million women followed over 25 years
• Source population: Utah Population Database records from 1996 to 2021

What the evidence actually shows (and who it applies to)

This was a retrospective cohort study using health records, which means it can identify associations over time but cannot prove that endometriosis causes type 2 diabetes.

The analysis included nearly 100,000 women diagnosed with endometriosis within the Utah Population Database cohort, and the authors report that diabetes risk differed across endometriosis forms. The researchers also noted the association was strongest among premenopausal women and women without obesity.

• Study type: retrospective cohort study (association, not causation)
• Population: women in the Utah Population Database (1996–2021), including nearly 100,000 with endometriosis
• Stronger association reported in: premenopausal women and women without obesity

Why endometriosis may matter for metabolic health

The authors suggest chronic inflammation linked with endometriosis may play a role in metabolic health, although they state more research is needed to understand the connection.

The team also reported that diabetes risk varied by endometriosis subtype, which they interpret as a sign the condition may have broader long-term health implications than previously recognized.

• Proposed link (not confirmed): chronic inflammation associated with endometriosis may relate to metabolic health
• Key idea: endometriosis may affect more than reproductive health alone (author interpretation)

Endometriosis and diabetes risk by subtype: what stood out

The study reported that some forms of endometriosis had a much stronger association with type 2 diabetes than others.

The strongest link was seen in extra-pelvic endometriosis, defined in the report as disease found outside the pelvis.

• Risk differed across endometriosis subtypes in the analysis
• Greatest association reported: extra-pelvic endometriosis (outside the pelvis)

Practical context for readers focused on metabolic health

If future research confirms these results, the authors note the findings could help clinicians identify people with endometriosis who may benefit from earlier screening or prevention efforts for type 2 diabetes.

Endometriosis affects about 1 in 10 women of reproductive age, and it occurs when tissue similar to the uterine lining grows outside the uterus and can cause chronic pelvic pain, infertility, and other complications. In this study, the strongest association appeared in groups not traditionally seen as highest-risk for type 2 diabetes (premenopausal women and women without obesity).

• Discussion point to raise in care: whether earlier metabolic screening is appropriate for someone with endometriosis, especially in the groups highlighted by the study
• Clinical context from the study: the authors frame screening and prevention as potential next steps if results are confirmed

Limitations and what to watch next

The researchers emphasize the results show an association, not proof that endometriosis causes type 2 diabetes.

They also state more research is needed to clarify the biological mechanisms connecting the conditions and to determine whether earlier metabolic screening could improve outcomes for women with endometriosis.

• Key limitation: observational association, not causation
• Open questions flagged by authors: mechanisms and whether earlier screening changes outcomes