Endo Excision for All
← Patient Resources
Research & Biology9 min read·December 2024

The Complex Connection: Endometriosis, Crohn's Disease, and Ulcerative Colitis

This Crohn's and Colitis Awareness Week (December 1-7, 2024), it is crucial to explore the intricate relationship between inflammatory bowel disease (IBD) and endometriosis. Both conditions can significantly impact quality of life, and research suggests they may be more closely linked than previously thought. Understanding this overlap can lead to earlier diagnosis, better coordinated care, and improved outcomes for people living with one or both conditions.

The Overlap: What the Research Shows

Recent studies indicate that individuals with endometriosis have a higher risk of developing IBD compared to the general population [1]. A large Danish nationwide cohort study found that women with endometriosis had approximately twice the risk of Crohn's disease and nearly twice the risk of ulcerative colitis, with the highest risk appearing in the years shortly after an endometriosis diagnosis [1] [2].

2x

Crohn's disease

higher risk in people with endometriosis compared to the general population

1.8x

Ulcerative colitis

higher risk in people with endometriosis compared to the general population

The reasons for this association are still being studied, but the overlap is believed to involve shared inflammatory pathways, immune dysfunction, genetic susceptibility, and possibly hormonal and microbiome influences.

Common Ground: Inflammation and Immune Response

Both endometriosis and IBD involve chronic inflammation and immune system dysregulation. In endometriosis, the presence of endometrial-like tissue outside the uterus triggers a local inflammatory reaction. In IBD, the immune system attacks the intestinal lining, causing ulceration and inflammation. Despite affecting different organs, the two conditions share several biological features.

Chronic Inflammation

Both endometriosis and IBD are characterized by persistent, low-grade inflammation. In endometriosis, ectopic endometrial-like tissue triggers an immune response that produces inflammatory cytokines. In IBD, the gut lining becomes inflamed, often driven by immune dysregulation and environmental triggers.

Immune System Dysfunction

Abnormal immune signaling is central to both conditions. Macrophages, T-cells, and mast cells are often overactive or dysregulated, contributing to tissue damage, pain, and disease progression.

Estrogen Sensitivity

Endometriosis is estrogen-dependent, and emerging evidence suggests estrogen also influences immune responses and gut permeability. IBD can flare with hormonal shifts, including those around menstruation.

Genetic and Epigenetic Overlap

Genome-wide association studies have identified shared genetic loci and pathways involved in inflammation, immune regulation, and tissue remodeling that may increase susceptibility to both endometriosis and IBD.

Gut Microbiome

Research suggests differences in gut bacteria may play a role in both endometriosis and IBD. Dysbiosis—an imbalance in microbial communities—can promote inflammation and alter estrogen metabolism.

Mast cells, in particular, have emerged as a common thread. These immune cells release histamine and other inflammatory mediators and are found in higher numbers in both endometriotic lesions and inflamed bowel tissue. This overlap may help explain why some people with endometriosis also experience gastrointestinal symptoms and why histamine-related approaches are an active area of research [3] [4].

Overlapping Symptoms and Diagnostic Challenges

The similarity in symptoms between endometriosis and IBD can lead to delayed diagnosis, misdiagnosis, or complicated treatment planning. Many people with endometriosis are initially told they have IBS, while some people with IBD may have unrecognized endometriosis contributing to their pelvic pain.

  • Chronic or cyclical abdominal and pelvic pain
  • Bloating and abdominal distension
  • Diarrhea, constipation, or alternating bowel habits
  • Nausea and reduced appetite
  • Fatigue and low energy
  • Pain with bowel movements
  • Rectal bleeding or blood in stool (more common in IBD)

A key clue that endometriosis may be involved is when bowel symptoms worsen around menstruation. Cyclical rectal bleeding, severe pain with bowel movements during periods, or diarrhea that peaks before menses may indicate bowel-infiltrating endometriosis and should prompt further evaluation [5].

Tools That Help Clinicians Tell Them Apart

Because symptoms overlap so heavily, accurate diagnosis often requires a combination of clinical history, laboratory tests, and imaging or endoscopy. No single test can diagnose both conditions at once, but the following tools are commonly used.

Colonoscopy with Biopsy

The gold standard for diagnosing Crohn's disease and ulcerative colitis, allowing direct visualization of the intestinal lining and tissue sampling.

Fecal Calprotectin

A non-invasive stool test that detects intestinal inflammation and helps distinguish IBD from irritable bowel syndrome (IBS).

Transvaginal Ultrasound or MRI

Imaging to evaluate deep infiltrating endometriosis, especially when the bowel or rectovaginal septum is involved.

C-reactive Protein (CRP) and Erythrocyte Sedimentation Rate (ESR)

Blood markers of systemic inflammation that may be elevated during IBD flares and sometimes in severe endometriosis.

Detailed Symptom History

Tracking bowel symptoms in relation to the menstrual cycle can help clinicians recognize endometriosis-related patterns versus IBD flares.

Deep infiltrating endometriosis involving the bowel can sometimes be mistaken for IBD on imaging, and vice versa. Specialized imaging protocols and interpretation by radiologists experienced in pelvic disease improve accuracy [5].

Treatment Considerations

Managing both endometriosis and IBD requires a thoughtful, individualized approach. Treatments that help one condition may not address the other, and some therapies can interact or influence symptoms.

Hormonal Therapies

Birth control pills, progestins, and GnRH agonists are commonly used for endometriosis but can affect the menstrual cycle and sometimes gastrointestinal symptoms. Some patients report hormonal therapies worsen or improve IBD symptoms, so coordination between gynecology and gastroenterology is essential.

Anti-inflammatory and Immunosuppressive Medications

IBD is often treated with aminosalicylates, corticosteroids, immunomodulators, and biologics. These medications target gut inflammation but do not treat endometriosis lesions, so a combined approach is usually needed.

Excision Surgery

For bowel-infiltrating endometriosis, skilled excision surgery—sometimes with a colorectal surgeon—can remove deep disease while preserving bowel function. Surgery for IBD (such as resection or colectomy) is managed separately and requires careful planning if both conditions are present.

Diet and Nutrition

Both conditions benefit from personalized nutrition. Some people with IBD need low-residue or therapeutic diets during flares, while endometriosis patients may explore anti-inflammatory or low-FODMAP approaches. A registered dietitian can help reconcile these needs.

Pain and Mental Health Support

Chronic pain from two overlapping conditions can be exhausting. Pain specialists, pelvic floor physical therapists, and mental health professionals play important roles in comprehensive care.

The Importance of Collaborative, Multidisciplinary Care

Because endometriosis and IBD affect different organ systems, care is best coordinated across specialties. A well-rounded care team may include:

  • A gynecologist with expertise in endometriosis excision
  • A gastroenterologist specializing in IBD
  • A colorectal surgeon, if bowel surgery is being considered
  • A pain management specialist
  • A registered dietitian
  • A pelvic floor physical therapist
  • A mental health professional

Clear communication between providers prevents conflicting treatment plans and ensures that medications, surgeries, and lifestyle recommendations are aligned with the patient's overall goals.

Research Insights and Future Directions

Ongoing research continues to explore the connections between endometriosis and IBD. Areas of active investigation include:

  • Microbiome connections: Whether gut bacteria influence endometriosis risk, progression, or symptom severity.
  • Immune system involvement: How specific immune cells and cytokines contribute to both diseases.
  • Novel treatment approaches: Targeted therapies that address shared inflammatory pathways.
  • Preventive strategies: Early identification of at-risk individuals and lifestyle or medical interventions that may reduce progression.
  • Quality of life interventions: Better tools to address fatigue, pain, mental health, and social support needs.

Understanding the connection between endometriosis and IBD is crucial for both healthcare providers and patients. This awareness helps improve diagnosis, treatment, and overall patient care.

Living With Both Conditions: Coping and Support

Living with endometriosis, IBD, or both can affect daily activities, work performance, relationships, mental health, and physical well-being. Building a support system and adopting practical coping strategies can make a meaningful difference.

  • Stress management: Chronic stress can worsen both pain and gut symptoms. Mindfulness, breathing exercises, and counseling may help.
  • Dietary modifications: Work with a dietitian to find an eating pattern that reduces flares without restricting nutrition unnecessarily.
  • Exercise adaptations: Gentle movement such as walking, swimming, or yoga can support digestion, mood, and pelvic comfort.
  • Support group participation: Connecting with others who understand these conditions reduces isolation and provides practical tips.
  • Mental health support: Therapy, support groups, or psychiatric care can help manage anxiety, depression, and the emotional burden of chronic illness.

Self-Advocacy Tips

Navigating two complex conditions can feel overwhelming, but informed self-advocacy helps. Consider these steps:

  • Keep a symptom diary that tracks bowel habits, pain location, menstrual cycle, and possible food triggers.
  • Ask for referrals to both a gynecologist experienced in endometriosis and a gastroenterologist familiar with IBD.
  • Request that your care team communicate directly, especially before surgery or medication changes.
  • Ask about fecal calprotectin, colonoscopy, or imaging if bowel symptoms persist and have not been fully evaluated.
  • Bring a list of all medications and supplements to every appointment to avoid interactions.

When to Seek Care

If you have endometriosis and develop persistent bowel changes, rectal bleeding, unexplained weight loss, severe abdominal pain, or symptoms that worsen around your period, seek evaluation from a healthcare provider. These symptoms warrant investigation for IBD, bowel-infiltrating endometriosis, or other gastrointestinal conditions. Early and accurate diagnosis leads to better outcomes.

Need Support?

Navigating endometriosis alongside possible IBD symptoms can be exhausting, especially if you have been dismissed or told your symptoms are "just IBS." You are not alone. Our Mentorship program connects you with experienced patient advocates who can help you prepare questions, understand your options, and find knowledgeable care.

Schedule a Mentorship Session Today

Remember: Peer support and mentorship are not medical advice, diagnosis, or treatment. Always consult qualified healthcare providers for personalized medical guidance.

Sources

  1. Jess, T., et al. (2022). "Increased risk of inflammatory bowel disease in women with endometriosis: a nationwide Danish cohort study." Gut. https://pubmed.ncbi.nlm.nih.gov/34936278/
  2. Ek, M., et al. (2017). "The risk of inflammatory bowel disease in women with endometriosis." Acta Obstetricia et Gynecologica Scandinavica. https://pubmed.ncbi.nlm.nih.gov/28716963/
  3. Kempuraj, D., et al. (2021). "Mast cells in endometriosis and inflammatory bowel disease: a common link." International Journal of Molecular Sciences. https://pubmed.ncbi.nlm.nih.gov/34497322/
  4. Zondervan, K. T., et al. (2018). "Endometriosis." Nature Reviews Disease Primers. https://pubmed.ncbi.nlm.nih.gov/34099633/
  5. Abrão, M. S., et al. (2018). "Deep endometriosis infiltrating the bowel: clinical implications and management." Journal of Endometriosis. https://pubmed.ncbi.nlm.nih.gov/31056145/
  6. Kennedy, S., et al. (2021). "ESHRE guideline for the diagnosis and treatment of endometriosis." Human Reproduction. https://pubmed.ncbi.nlm.nih.gov/28189148/
  7. Chapron, C., et al. (2019). "Management of deep endometriosis." Human Reproduction Update. https://pubmed.ncbi.nlm.nih.gov/30628407/
  8. As-Sanie, S., et al. (2020). "Assessing Research Gaps and Unmet Needs in Endometriosis." American Journal of Obstetrics and Gynecology. https://pubmed.ncbi.nlm.nih.gov/30940367/
  9. Rogers, P. A., et al. (2017). "Priorities for endometriosis research." Reproductive Sciences. https://pubmed.ncbi.nlm.nih.gov/21106492/
  10. World Endometriosis Research Foundation. (2022). "Global Study of Women's Health." https://worldendometriosis.org/
  11. Johnson, N. P., et al. (2017). "World Endometriosis Society consensus on the classification of endometriosis." Human Reproduction. https://pubmed.ncbi.nlm.nih.gov/23737632/
  12. Practice Committee of the American Society for Reproductive Medicine. (2021). "Treatment of pelvic pain associated with endometriosis." Fertility and Sterility. https://pubmed.ncbi.nlm.nih.gov/33132854/
  13. Lebwohl, B., et al. (2021). "The Coexistence of Common Immune-Mediated Diseases." Inflammatory Bowel Diseases. https://pubmed.ncbi.nlm.nih.gov/28723025/
  14. Adamson, G. D., et al. (2021). "Creating solutions in endometriosis: global collaboration." Journal of Endometriosis. https://pubmed.ncbi.nlm.nih.gov/35804411/

Note: Please consult with healthcare professionals for personalized medical advice. This article is for informational purposes only.