Solitary Rectal Ulcer Syndrome

Solitary rectal ulcer syndrome (SRUS) is an uncommon condition — roughly 1 in 100,000 people per year — that causes symptoms overlapping heavily with both hemorrhoids and inflammatory bowel disease, and is frequently misdiagnosed as one of those before the correct diagnosis is reached.

Key takeaways

Despite the name, SRUS doesn’t always involve an actual ulcer, and it isn’t always solitary — the name is a known misnomer.
It’s linked to straining, chronic constipation, and sometimes rectal prolapse or dysfunctional coordination of the pelvic floor during bowel movements.
Common symptoms include straining, a sense of incomplete emptying, bleeding, and mucus — the same list associated with hemorrhoids.
Diagnosis requires endoscopy with biopsy, and it’s sometimes mistaken for Crohn’s disease or misdiagnosed for a long time before being correctly identified.

What it is

SRUS is thought to relate to local trauma or reduced blood flow to the rectal lining, often from repeated straining, rectal prolapse, or paradoxical contraction of the pelvic floor muscles during attempted bowel movements (the muscles tighten instead of relaxing, making stool harder to pass and encouraging more straining). Over time, this can cause ulceration, thickened or polyp-like tissue changes, or areas of redness in the rectal lining — sometimes with no visible ulcer at all, despite the name.

Symptoms

Straining during bowel movements
A persistent sense of incomplete emptying (tenesmus)
Rectal bleeding
Passing mucus
Constipation
In some cases, no symptoms at all before diagnosis — SRUS is occasionally found incidentally

Notice that every item on this list also describes typical hemorrhoid symptoms — which is exactly why this condition tends to be misattributed for a long time.

Why it gets mistaken for other conditions

SRUS symptoms overlap substantially with hemorrhoids (straining, bleeding, incomplete emptying) and, because of the tissue changes it can cause, has been mistaken for inflammatory bowel disease — including cases specifically documented as being treated for presumed Crohn’s disease before SRUS was correctly identified. It also frequently occurs alongside rectal prolapse, which has its own overlapping symptom picture (see Rectal prolapse vs. hemorrhoid prolapse).

How it’s diagnosed

SRUS requires direct visualization of the rectum (sigmoidoscopy or colonoscopy) with a biopsy of the affected tissue — it can’t be diagnosed from symptoms or an external exam alone, and biopsy is what distinguishes it from other causes of rectal ulceration or bleeding, including IBD.

Treatment

Management typically starts with addressing the underlying straining pattern — often through fiber, avoiding excessive straining, and sometimes biofeedback therapy to retrain pelvic floor coordination during bowel movements. More persistent or severe cases, especially with associated rectal prolapse, may need surgical evaluation. Full remission can be difficult to achieve, and treatment is usually managed by a colorectal specialist.

When to see a doctor

Persistent straining, bleeding, or a sense of incomplete emptying that hasn’t resolved with standard hemorrhoid self-care
Any of these symptoms alongside known or suspected rectal prolapse
Symptoms that have been treated as hemorrhoids or IBD without full improvement

Dealing with straining and a sense of incomplete emptying without other symptoms? See Is it hemorrhoids or something else? for the broader picture.

This page is for general education. SRUS requires endoscopic biopsy for diagnosis — it can’t be identified from symptoms alone.