Exploring public and private options for the Canadian health consumer.

Endometriosis and the Immune System: What New Research Is Showing

  • Rafka Abou-Khalil

    • Summary

    This March, for Endometriosis Awareness Month, new studies are highlighting that the condition is closely linked to the immune system. Researchers have found that endometriosis shares many traits with autoimmune diseases, creating a cycle of inflammation throughout the body. This helps explain why the disease causes systemic symptoms like fatigue and why it is so difficult to treat.

    March is Endometriosis Awareness Month, a time to shine a light on a condition that affects approximately 1 in 10 girls, women, and people with a uterus in Canada. Despite this, it is still widely misunderstood and underdiagnosed. While endometriosis is best known for causing severe pelvic pain and fertility challenges, researchers are now looking more closely at another possible piece of the puzzle: the immune system.

    New studies suggest people with endometriosis may be more likely to develop certain immune-related diseases. Here’s what the science actually shows, and what it doesn’t.

    Endometriosis Is More Than a Gynecological Condition

    Endometriosis happens when tissue similar to the lining of the uterus grows outside the uterus. Scientists describe it as a “systemic inflammatory disease characterized by the presence of endometrial-like tissue beyond the uterine cavity”. It essentially is an often-painful condition in which tissue that is similar to the inner lining of the uterus grows outside the uterus.

    Symptoms often include chronic pain, heavy periods, and infertility.

    Researchers increasingly believe the condition involves the whole body, especially the immune system, not just the reproductive organs.

    People With Endometriosis Show Higher Rates of Autoimmune Diseases

    One large study looked at more than 332,000 people with endometriosis and compared them with over 1.2 million people without the condition. The researchers found that autoimmune diseases were diagnosed more often in those with endometriosis within two years of their diagnosis.

    The conditions with higher odds included:

    Overall, the study found “the odds of receiving a diagnosis of at least one of the autoimmune conditions… was roughly two times greater among patients with endometriosis” compared with similar people without it.

    In real numbers, about 4.93% of patients with endometriosis were diagnosed with at least one autoimmune condition within two years, compared with 1.42% of people in the control group.

    Scientists See Possible Immune System Problems

    Why might these conditions be connected? Researchers point to immune system changes seen in people with endometriosis.

    The Nature study reports “chronic inflammation and immune cell dysregulation” in patients. This includes:

    These kinds of immune changes are also involved in many autoimmune diseases. Notably, women are disproportionately affected: studies suggest roughly 78% to 80% of autoimmune disease patients are female, with risk influenced by hormonal and genetic factors

    Inflammation may be another shared factor. People with endometriosis often have higher levels of inflammatory molecules which are also linked to autoimmune conditions.

    Researchers say these findings “support the plausibility of a link between endometriosis and autoimmune conditions”.

    But Researchers Urge Caution

    Despite the strong signals, experts are clear: this research shows a link, not proof that one condition causes the other.

    Because the major study looked back at existing medical records, the authors say it cannot determine cause and effect. It’s also unclear which condition may come first in many patients.

    The researchers emphasize that while findings indicate an association, they do not necessarily “confirm a causal relationship”.

    Why This Matters

    Even without proof of causation, the findings are important.

    They suggest:

    Researchers also note that chronic inflammation itself can increase risk for developing numerous chronic conditions, including autoimmune conditions.

    The Bottom Line

    As Endometriosis Awareness Month draws attention to the condition, the science is evolving. Large studies now show people with endometriosis are about twice as likely to be diagnosed with certain autoimmune diseases in the short term.

    Scientists have identified several immune system changes that could help explain the connection. Still, researchers stress that the relationship is not yet fully understood.

    What is clear is that endometriosis is more complex than once believed, and understanding its links to the immune system may be key to improving diagnosis, care, and future treatments.

    As Awareness Month progresses, the message from the medical community is clear: Endometriosis is a systemic inflammatory disease. Understanding its link to the immune system is the first step toward faster diagnoses and more effective, long-term treatments.

    Subscribe to The Health Insider newsletter where you’ll find many more insights – delivered straight to your inbox.

    ~ Read more from The Health Insider ~

    The information provided on TheHealthInsider.ca is for educational purposes only and does not substitute for professional medical advice. TheHealthInsider.ca advises consulting a medical professional or healthcare provider when seeking medical advice, diagnoses, or treatment. To read about our editorial review process click here.

    Exit mobile version