Endometriosis and the Bowel: How to Know If Your Gut Symptoms Are More Than IBS
Endometriosis is widely known for causing pelvic pain and painful periods, but for many patients, the symptoms extend far beyond the reproductive system. Bowel endometriosis is a common yet often misdiagnosed form of the disease, where endometrial-like tissue grows on or inside the intestines—most often the rectum or sigmoid colon.
Because its symptoms overlap with gastrointestinal disorders like Irritable Bowel Syndrome (IBS), many people suffer for years before receiving an accurate diagnosis. Understanding the differences between bowel endometriosis and common GI issues is key to finding the right treatment—and lasting relief.
What Is Bowel Endometriosis?
Bowel endometriosis occurs when tissue similar to the uterine lining implants on the outer wall of the bowel (serosa) or infiltrates deeper layers. In severe cases, lesions may penetrate the muscular layer or even the lumen of the colon.
This type of deep infiltrating endometriosis (DIE) is often found in the rectosigmoid region—the part of the colon closest to the uterus. Because the bowel and uterus share close anatomical space, endometriosis can easily affect both.
Symptoms That May Indicate Bowel Endometriosis
Many bowel endometriosis symptoms mimic IBS or other GI disorders, but they tend to flare cyclically, worsening before or during menstruation.
Common signs include:
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Painful bowel movements (dyschezia), especially during your period
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Cyclic constipation or diarrhea
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Rectal pain or pressure
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Bloating and abdominal distension (“endo belly”)
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Nausea during menstruation
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Bleeding from the rectum with no GI diagnosis
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A sensation of incomplete evacuation
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Pelvic pain that worsens with digestion or food intake
If these symptoms worsen around your cycle or have persisted despite GI treatment, bowel endometriosis could be the root cause.
Why It’s Often Misdiagnosed as IBS
IBS and endometriosis both affect the gut—but in different ways. IBS is a functional disorder with no structural cause. Bowel endometriosis is anatomical and inflammatory, caused by real tissue growing where it doesn’t belong.
Standard GI tests (e.g., colonoscopies or ultrasounds) often miss bowel endometriosis, especially when the disease is external to the intestinal wall. Without specialized imaging or surgical evaluation, the disease may be misattributed to IBS, anxiety, or food sensitivities.
When to Consider Surgery for Bowel Endometriosis
Medical therapies like hormonal suppression may temporarily reduce inflammation, but they cannot remove the lesions. In moderate to severe cases, surgery is the only definitive treatment.
At Endometriosis Surgical Specialists International (ESSI), our team includes gynecologic MIGS (minimally invasive gynecologic surgeons) and colorectal surgery specialists. Together, we perform advanced procedures such as:
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Rectal shaving (removing surface lesions)
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Discoid excision (removing full-thickness lesions in a disc shape)
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Segmental resection (removing affected portions of bowel)
Our nerve-sparing and fertility-preserving techniques are designed to relieve pain, improve bowel function, and support long-term quality of life.
Do You Need an Evaluation?
If you’ve been told you have IBS but your symptoms worsen around your period, don’t respond to standard GI treatment, or include rectal pain or bleeding—seek an evaluation by a ESSI endometriosis surgeon.
ESSI treats patients in New York, New Jersey, Miami, Los Angeles, Orange County, and Europe, providing expert excision surgery and multidisciplinary care for complex endometriosis cases.
