Women fighting the chronic pelvic pain of endometriosis now have another health risk to watch for: migraines strike them at more than twice the normal rate.
Story Snapshot
- A large analysis found women with endometriosis have 2.3 times the odds of migraine compared with women who don’t have the condition.
- The estimate pooled data from 35 studies covering more than 13 million women worldwide, including over 207,000 with endometriosis.
- A separate peer-reviewed 2025 study found an almost identical link, reporting an odds ratio of 2.25.
- Researchers believe shared inflammation and nerve-pain pathways may explain why the two conditions show up together so often.
A Striking Link Backed By Millions Of Medical Records
The headline number comes from an analysis of 35 studies stretching back roughly 50 years. Researchers compared migraine rates between 207,675 women with endometriosis and nearly 13 million women without it. Women with endometriosis had 2.3 times the odds of also suffering migraines, with a confidence range of 1.75 to 3.05, meaning the link is statistically solid, not a fluke of small numbers.
That data was shared at the American Neurological Association Annual Meeting rather than published yet in a peer-reviewed journal, so the full study details and author list are not fully public. Still, the sheer size of the sample, spanning decades and continents, gives the finding real weight even before formal publication.
Earlier Peer-Reviewed Science Pointed The Same Direction
This isn’t the first time researchers have spotted the pattern. A 2025 systematic review and meta-analysis, published in a peer-reviewed journal, pooled 13 studies covering 331,655 people and found women with endometriosis had 2.25 times the odds of migraine, a number remarkably close to the newer figure. An earlier 2020 meta-analysis found a smaller but still clear connection, putting the odds ratio at 1.56. The rising numbers across separate studies suggest the link is real and may even be stronger than first believed.
Scientists running the 2025 review flagged real variation between studies, a statistical wobble known as heterogeneity, meaning the exact size of the risk shifts depending on how researchers define and track both conditions. That doesn’t erase the pattern. It just means doctors and patients should treat the 2.3 figure as a strong signal rather than a fixed, unchangeable number.
Why Pain And Inflammation May Travel Together
Endometriosis happens when tissue similar to the uterine lining grows outside the uterus, triggering chronic inflammation and pain signals that misfire through the nervous system. Migraines share some of that same biology, involving inflamed nerves and overactive pain pathways. Researchers behind the new analysis pointed to these overlapping mechanisms as a likely reason the two conditions cluster together in the same patients.
Both conditions are also notoriously hard to diagnose quickly. Endometriosis patients often see doctors far more often than other women in the years before they’re finally diagnosed, racking up emergency visits and specialist referrals along the way. That pattern of frequent medical contact can mean migraines get caught and labeled sooner too, simply because these women are already in the exam room more often.
What This Means For Women And Their Doctors
For the roughly one in ten women of reproductive age living with endometriosis, this research is a practical heads-up. If pelvic pain is already part of life, persistent headaches shouldn’t be brushed off as unrelated stress or bad luck. Bringing both symptoms to a doctor in the same conversation could speed up diagnosis and open the door to treatment plans that address pain and inflammation together, rather than treating two conditions in isolation.
The bigger picture here is one common sense already supports: take women’s chronic pain seriously and investigate it thoroughly instead of dismissing it. Decades of research now point to a real, measurable connection between endometriosis and migraines. That’s not a reason for alarm. It’s a reason for women and their physicians to connect the dots sooner.
Sources:
mindbodygreen.com, acnr.co.uk, headachemedicine.com.br, tandfonline.com
