Quick Answer
Yes, endometriosis can be associated with bowel and digestive symptoms, particularly when symptoms follow a menstrual or cyclical pattern. Bloating, constipation, diarrhoea, painful bowel movements and changes in bowel habits can occur. Importantly, bowel symptoms do not necessarily mean that endometriosis directly involves the bowel. 2 3 4
If digestive symptoms repeatedly become worse around your period—especially pain when passing stool—it is worth discussing the pattern with your gynaecologist.
Introduction
You may have noticed something peculiar about your periods.
The cramps arrive—and suddenly your stomach is unsettled too. You feel bloated, your bowel movements change, passing stool becomes painful, or you alternate between constipation and diarrhoea.
It is tempting to call it “period digestion.”
Sometimes, ordinary menstrual changes really can affect the gut. But when severe bowel symptoms repeatedly follow your menstrual cycle, endometriosis deserves consideration. 1 2
From the Doctor’s Desk
Bowel symptoms are sometimes overlooked when women talk about period pain. But the timing of digestive symptoms can provide an important clinical clue.
Painful bowel movements, particularly when they repeatedly occur around menstruation, should not automatically be dismissed as “normal period symptoms.” At the same time, bowel symptoms alone do not diagnose endometriosis. They need to be considered alongside the rest of the menstrual, pelvic and gastrointestinal history. 2 3
If you notice a predictable pattern, write it down and bring it to your gynaecologist. You do not have to wait until the pain becomes unbearable before asking whether there may be an underlying cause.
— Dr Sowmya Sampurna
Your Uterus Isn’t the Only Thing Responding to Your Cycle
Endometriosis occurs when endometrial-like tissue grows outside the uterus. These lesions can occur around the ovaries, pelvic lining, bowel, bladder and other structures.
Because this tissue responds to hormonal changes, inflammation and bleeding around the menstrual cycle can irritate nearby tissues and contribute to pain. Adhesions can also develop and cause pelvic organs to become stuck together. 3
When endometriosis involves or sits close to the bowel, symptoms can become particularly noticeable around menstruation.
But here’s an important nuance: You can have bowel symptoms with endometriosis even when the bowel itself is not directly involved. 4
That distinction is often missed.
What Can Endometriosis Do to Your Digestion?
The symptoms can vary from woman to woman.
You might experience:
- Bloating or abdominal swelling
- Constipation
- Diarrhoea
- Alternating constipation and diarrhoea
- Cramping or abdominal pain
- Painful bowel movements
- A feeling of incomplete bowel emptying
- Rectal bleeding, particularly around menstruation 2 3
One particularly important symptom is dyschezia—painful or difficult bowel movements. If passing stool becomes noticeably painful specifically during your period, don’t dismiss it as “just bad cramps.”
NICE specifically lists period-related or cyclical gastrointestinal symptoms, particularly painful bowel movements, among the symptoms that should raise suspicion of endometriosis. 2
Why Does It Get Worse Around Your Period?
This is where the timing becomes a valuable clue.
Endometriosis-related inflammation can fluctuate with hormonal changes throughout the menstrual cycle. If lesions are close to the bowel, the surrounding inflammation and pelvic sensitivity may make bowel movements more painful around menstruation. 3
Some women notice a pattern such as:
A few days before the period → bloating or bowel changes → period begins → painful bowel movements → symptoms settle afterwards.
That recurring monthly pattern is worth telling your doctor. It doesn’t prove endometriosis—but it is clinically useful information. 2
But Isn’t Diarrhoea During Periods Normal?
It can be.
Menstrual cramps themselves can be accompanied by diarrhoea, nausea and other gastrointestinal symptoms. Prostaglandins released during menstruation can influence the bowel as well as the uterus. 5
So one episode of loose stools during your period does not mean you have endometriosis.
The concern is more about the overall pattern:
- Is the pain severe?
- Does it repeatedly follow your cycle?
- Is passing stool painful?
- Are symptoms getting worse over time?
- Are they interfering with work, school or everyday life?
- Do you also have painful periods, deep pain during sex or infertility?
When several of these occur together, an endometriosis assessment becomes more important. 1 2
What About IBS?
This is where things can get confusing.
Irritable bowel syndrome (IBS) can cause bloating, abdominal pain, diarrhoea, constipation and changes in bowel habits.
And women with endometriosis appear to have a higher likelihood of also meeting criteria for IBS. A meta-analysis of 17 studies involving more than 96,000 participants found approximately threefold higher odds of IBS among women with endometriosis compared with controls. 6
So it isn’t necessarily: Endometriosis OR IBS.
Sometimes it can be: Endometriosis AND IBS.
This is why a woman whose bowel symptoms have been labelled “IBS” but consistently become dramatically worse around menstruation may benefit from discussing the menstrual connection with her doctor.
Does Bowel Trouble Mean the Endometriosis Has Reached the Bowel?
Not necessarily.
Gastrointestinal symptoms can occur in women with endometriosis even without bowel lesions. 4
When endometriosis does directly involve the bowel, the rectum and sigmoid colon are common sites, although other parts of the bowel can be affected. Deep bowel endometriosis can cause symptoms such as painful defecation, constipation, diarrhoea, changes in bowel habits and, sometimes, rectal bleeding. 3
This distinction matters because symptoms alone cannot tell you exactly where endometriosis is located.
What Should You Do If You Notice the Pattern?
Start by tracking it.
For two or three cycles, record:
Period day → bowel movements → pain → bloating → constipation/diarrhoea → pain during stool → bleeding
You may discover a pattern you hadn’t noticed before.
Then take that information to your gynaecologist.
Depending on your symptoms, your doctor may consider pelvic examination and imaging. NICE recommends a transvaginal ultrasound for suspected endometriosis, including to look for deep endometriosis involving the bowel. A normal ultrasound, however, does not completely exclude endometriosis. 2
If deep disease is suspected, specialist ultrasound or pelvic MRI may be appropriate. 2
Don’t Automatically Blame Every Digestive Symptom on Endometriosis
This is equally important.
Persistent diarrhoea, constipation, blood in the stool, unexplained weight loss or other gastrointestinal symptoms may have causes unrelated to endometriosis.
IBS, inflammatory bowel disease, coeliac disease, infections and other gastrointestinal conditions can produce overlapping symptoms. 6 7
So the goal isn’t to see endometriosis everywhere.
It is to recognise when your digestive symptoms have a meaningful menstrual pattern and make sure the right questions are being asked.
Your Bowel Symptoms Are Worth Mentioning
Many women are comfortable telling a doctor about painful periods.
Far fewer mention:
“It hurts when I pass stool during my period.”
Please do.
That seemingly awkward detail may be one of the most useful clues in the entire consultation.
Your period doesn’t have to shut down your life.
And if severe menstrual pain comes with predictable bowel symptoms month after month, you deserve an explanation—not just another reminder to tolerate the pain.
Key Takeaways
- Endometriosis can be associated with bloating, constipation, diarrhoea, painful bowel movements and other gastrointestinal symptoms. 2 3
- Cyclical painful bowel movements, especially around menstruation, are an important symptom to discuss with a doctor. 2
- Ordinary periods can also cause diarrhoea and other digestive symptoms, so bowel changes alone do not diagnose endometriosis. 5
- Endometriosis and IBS can coexist, and their symptoms can overlap considerably. 6
- Bowel symptoms do not necessarily mean that endometriosis directly involves the bowel. 4
- Tracking digestive symptoms alongside your menstrual cycle can make important patterns easier to recognise.
- Persistent, severe or worsening symptoms deserve medical assessment.
References
[1] American College of Obstetricians and Gynecologists. Endometriosis. ACOG — Endometriosis. ACOG also published updated clinical guidance on endometriosis diagnosis in 2026.
[2] National Institute for Health and Care Excellence. Endometriosis: Diagnosis and Management (NG73). Updated 2024. NICE — Endometriosis: Diagnosis and Management.
[3] European Society of Human Reproduction and Embryology. ESHRE Guideline: Endometriosis. 2022. ESHRE — Endometriosis Guideline.
[4] Mettler L, et al. Relevance of gastrointestinal symptoms in endometriosis. 2009. PubMed — Gastrointestinal Symptoms in Endometriosis.
[5] American College of Obstetricians and Gynecologists. Dysmenorrhea: Painful Periods. ACOG — Painful Periods.
[6] Nabi MY, et al. Endometriosis and irritable bowel syndrome: A systematic review and meta-analyses. Frontiers in Medicine. 2022. PubMed — Endometriosis and IBS Meta-analysis.
[7] American College of Obstetricians and Gynecologists. Problems of the Digestive System. ACOG — Digestive System Problems.