
Endometriosis and Autoimmune Disease: Understanding the Link
How immune dysregulation connects endometriosis with autoimmune diseases—what the science shows, comorbid risks, and implications for diagnosis and care.

Unraveling the Connection Between Endometriosis and Autoimmune Diseases
Endometriosis causes pain, multiple bowel symptoms, and infertility, among many other debilitating symptoms, and affects about 10% of women, mostly in the reproductive age range. Developing research has indicated a link between endometriosis and various autoimmune conditions.
Understanding Endometriosis
Endometriosis is a chronic gynecological disorder characterized by the presence of endometrial-like tissue growing outside the uterus. The cells resemble those lining the inner part of the uterus but differ markedly in multiple ways at the molecular level. The more we learn, the less certain the origins appear to be. They are likely partly genetic and partly influenced by multiple environmental factors acting on the body and genes.
The Immune System’s Role
Research suggests that abnormalities in the immune system may play a key role in the development of endometriosis. These abnormalities could prevent the immune system from effectively clearing ectopic endometrial cells, regardless of how they arrive there, allowing them to implant and grow outside the uterus. This hypothesis suggests that endometriosis might be, at least in part, an immunity-associated disorder.
Endometriosis is often accompanied by a chronic inflammatory response, triggered by the presence of ectopic endometrial-like cells. This inflammation, coupled with the immune system’s inability to effectively remove ectopic cells, could partly explain the chronic pain often associated with the condition.
Is Endometriosis an Autoimmune Disease?
Autoimmune diseases occur when the immune system mistakenly attacks the body’s own cells, treating them as foreign invaders. The link between endometriosis and autoimmune diseases is still being explored, and multiple studies suggest that women with endometriosis may have a higher risk for certain autoimmune conditions. It is not clear whether endometriosis carries a risk of developing autoimmune diseases, whether the reverse is true, or whether they simply share common molecular mechanisms that could result in both occurring in any given individual. At this point, it is important to stress that an association does not mean cause.
This review aims to delve into the current state of research on whether endometriosis is an autoimmune disease, presenting key findings from population-based studies, discussing potential implications, and highlighting areas for future research.
Systemic Lupus Erythematosus (SLE) and Endometriosis
Systemic Lupus Erythematosus (SLE) is an autoimmune disease characterized by inflammation and damage to various tissues, including the skin, joints, kidneys, and heart. Some studies suggest a positive association between endometriosis and SLE. One study reported a seven-fold increase in the odds of having SLE among women with endometriosis, though it relied on self-reported diagnoses, which may introduce bias. A more recent cohort study found a more modest but still significant elevation in SLE risk among women with endometriosis.
Sjögren’s Syndrome (SS) and Endometriosis
Sjögren’s Syndrome (SS) is an autoimmune disorder marked by dry eyes and mouth, often accompanied by other systemic symptoms. A meta-analysis of three case-control studies found a 76% higher odds of SS in women with endometriosis. These studies had small sample sizes and wide confidence intervals, indicating a need for further research. Confidence intervals describe the range around a measurement that indicates how accurate the conclusion might be; the tighter the range among measurements, the better.
Rheumatoid Arthritis (RA) and Endometriosis
Rheumatoid Arthritis (RA) is a chronic inflammatory disorder affecting many joints, including those in the hands and feet. Some research suggests a link between endometriosis and an increased risk of developing RA. One meta-analysis found a 50% increased risk of RA among women with endometriosis, but the studies included had limitations such as small sample sizes and wide confidence intervals.
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Schedule Your ConsultAutoimmune Thyroid Disorders (ATD) and Endometriosis
Autoimmune thyroid disorders (ATDs), including Graves’ disease and Hashimoto’s thyroiditis, arise when the immune system attacks the thyroid gland, leading to either overactivity (hyperthyroidism) or underactivity (hypothyroidism). A meta-analysis of three case-control studies suggested a non-significant increase in the odds of ATD in women with endometriosis. The studies showed high heterogeneity and low-quality scores, underscoring the need for further research.
Coeliac Disease (CLD) and Endometriosis
Coeliac disease (CLD) is an autoimmune disorder in which ingestion of gluten leads to damage in the small intestine. A meta-analysis of two case-control studies found a four-fold increase in the odds of CLD among women with endometriosis. As with several other findings, small sample sizes and wide confidence intervals point to the need for additional investigation.
Multiple Sclerosis (MS) and Endometriosis
Multiple Sclerosis (MS) is a chronic disease that attacks the central nervous system. Current research on the association between MS and endometriosis is limited and inconclusive, with some studies suggesting a possible link and others finding no significant association.
Inflammatory Bowel Disease (IBD) and Endometriosis
Inflammatory bowel disease (IBD), including Crohn’s disease and ulcerative colitis, is characterized by chronic inflammation of the gastrointestinal tract. One study reported a 50% increase in the risk of IBD among women with endometriosis, although the sample size was small and the confidence interval was wide, indicating a need for further research.
The Bigger Picture
While the evidence for an association between endometriosis and certain autoimmune diseases is compelling, correlation or association does not imply causation. Further research is needed to determine whether endometriosis actually increases the risk of developing autoimmune diseases or vice versa, or whether the two share common risk factors or underlying mechanisms. The potential link highlights the importance of a comprehensive approach to women’s health. For women with endometriosis, awareness of a possible increased risk of autoimmune diseases can inform healthcare decisions and monitoring.
Study Findings at a Glance
Condition | Study Type | Reported Association | Key Limitations |
|---|---|---|---|
SLE | Case-control | Seven-fold increase in odds among women with endometriosis | Self-reported diagnoses may introduce bias |
SLE | Cohort | Modest but significant elevation in risk | General study limitations not fully detailed |
Sjögren’s Syndrome | Meta-analysis of 3 case-control studies | 76% higher odds in women with endometriosis | Small sample sizes; wide confidence intervals |
Rheumatoid Arthritis | Meta-analysis | 50% increased risk in women with endometriosis | Small samples; wide confidence intervals |
Autoimmune Thyroid Disorders | Meta-analysis of 3 case-control studies | Non-significant increase in odds | High heterogeneity; low-quality scores |
Coeliac Disease | Meta-analysis of 2 case-control studies | Four-fold increase in odds | Small sample sizes; wide confidence intervals |
Multiple Sclerosis | Mixed/limited studies | Limited and inconclusive; mixed findings | Insufficient data; inconsistent results |
Inflammatory Bowel Disease | Single study | 50% increase in risk in women with endometriosis | Small sample size; wide confidence interval |
The Path Ahead
The intersection of endometriosis and autoimmune diseases is a complex and evolving field of research. Better understanding the relationship between these conditions could improve diagnosis, treatment, and ultimately, the quality of life for patients with endometriosis. Continued exploration of this connection is providing new insights into the pathophysiology of endometriosis and autoimmune diseases, potentially leading to novel treatments and preventive strategies.
Quick Answers
How rare is endosalpingiosis?
Endosalpingiosis is generally considered uncommon, but “how rare” it is depends heavily on who’s being studied and how it’s found. Many cases are discovered incidentally on pathology—meaning tissue is identified under the microscope after surgery done for other reasons—so it’s likely underrecognized in the general population. In other settings (like surgical cohorts), it may appear more often simply because more tissue is being sampled and examined carefully.
What matters most for patients is that endosalpingiosis can be confused with endometriosis on imaging or even at surgery, yet it doesn’t always behave the same way clinically. If you’ve been told you have endosalpingiosis and you also have pelvic pain, bowel/bladder symptoms, or fertility concerns, our team can help interpret what that finding means in the context of your symptoms and operative/pathology reports. You’re welcome to explore our educational content on related endometriosis and uterine conditions, and reach out to schedule a consultation if you want a personalized plan.
Can endometriosis cause a painful bump near the anus?
Yes. Endometriosis can contribute to pain and pressure around the rectum and anal area, especially when disease involves the rectum/rectosigmoid region or nearby tissues. Many patients describe deep pain with bowel movements, rectal pressure, or symptoms that flare around their cycle, and those patterns can fit bowel or deep infiltrating endometriosis.
That said, a sensitive bump on the anus itself is more often something else (like a hemorrhoid, fissure, skin infection/abscess, or another localized anal/skin condition). In some cases, pelvic disease can coexist with these issues, which is why we don’t assume every finding is endometriosis—or dismiss it as “nothing.”
If you’re noticing a new, persistent, or worsening bump—especially if it’s very tender, draining, bleeding, or associated with fever—we want to evaluate the full picture. Our team can sort out whether your symptoms point toward bowel endometriosis, a separate anorectal condition, or both, and plan next steps such as a focused exam and, when appropriate, expertly interpreted imaging to map possible deep disease.
When is menstrual bleeding considered too heavy?
Menstrual flow is generally “too heavy” when it consistently disrupts your life or overwhelms your usual period products—think flooding or soaking through pads/tampons quickly, passing frequent or large clots, needing to double up, or bleeding long enough that you can’t plan around it. Another major clue is fatigue, dizziness, or shortness of breath that can come with iron deficiency from ongoing blood loss. If you’re timing your day around bathrooms, waking at night to change products, or avoiding work, exercise, travel, or sex because of bleeding, that’s not something we consider “normal.”
Heavy bleeding is a symptom, not a diagnosis, and common underlying drivers include adenomyosis, fibroids, hormonal imbalance, and sometimes endometriosis—especially when heavy bleeding shows up with severe cramps or deep pelvic pain. Because imaging and symptoms don’t always match (a scan can look “mild” while symptoms are intense), we take a symptom-led approach and look at the full pattern, including pain, pressure, clots, cycle timing, and any signs of anemia. If your bleeding feels like it’s escalating or you’ve been told to “just live with it,” our team can help you sort out likely causes and build a plan that targets the source—not just the bleeding.
Can endometriosis cause arthritis-like joint pain?
Yes—endometriosis can be associated with arthritis-like joint pain in some people, even though joint pain isn’t considered a classic “core” symptom. Endometriosis can drive chronic inflammation and immune dysregulation, and that whole-body inflammatory state may show up as aching, stiffness, or flares that feel similar to inflammatory arthritis. Some patients also notice joint symptoms that cycle with their period or worsen during broader endometriosis flares.
At the same time, endometriosis doesn’t “equal” autoimmune arthritis, and an association doesn’t prove that one causes the other. Research suggests higher rates of certain autoimmune conditions in people with endometriosis—including inflammatory diseases that can affect joints—so persistent joint pain deserves a full-picture evaluation rather than being automatically attributed to pelvic disease alone. If you’re dealing with pelvic pain plus joint symptoms, our team can help you sort out what fits endometriosis, what may be a related immune condition, and how that affects your treatment plan, including whether excision surgery and coordinated integrative support make sense for you.
What do endometriosis blood clots look like?
Endometriosis itself doesn’t create a specific, recognizable “type” of blood clot you can identify just by looking. The clots you pass during a period are usually clotted menstrual blood mixed with pieces of shed uterine lining, so they can look dark red to deep brown, jelly-like, stringy, or like thicker “chunks”—and this can happen with or without endometriosis.
What matters more than appearance is the pattern that comes with it. If you’re seeing clots along with heavy or abnormal bleeding, severe or worsening period pain, pain with sex, bowel or bladder symptoms, or pelvic pain that isn’t limited to bleeding days, that combination can fit with endometriosis (and can also overlap with other conditions like adenomyosis or fibroids). If this is what you’re experiencing, our team can help you sort out the likely drivers and discuss what a thorough evaluation and long-term treatment plan can look like—including when minimally invasive excision surgery is worth considering.

