Radiation Proctitis
Radiation proctitis is inflammation of the rectum that develops after radiation therapy to the pelvic area — used to treat cancers like cervical, prostate, or rectal cancer. If you’ve had pelvic radiation, this is a relevant possibility to know about specifically, since its symptoms overlap with hemorrhoids and it can appear well after treatment has ended.
- Radiation proctitis comes in an acute form (during or shortly after radiation) and a chronic form (which can appear months to years later).
- Symptoms include rectal bleeding, diarrhea, urgency, and pain — closely overlapping with hemorrhoid symptoms.
- People with a history of hemorrhoids before radiation may have worsening of those hemorrhoid symptoms during treatment, which can be difficult to distinguish from radiation-related changes.
- Diagnosis requires endoscopy; treatment differs from standard hemorrhoid care and is usually managed by a gastroenterologist.
The two forms
Acute radiation proctitis develops during radiation treatment or shortly after, affecting a large share of people who receive pelvic radiation to some degree. It typically causes increased bowel frequency, urgency, diarrhea, rectal bleeding, and anal or rectal pain, and usually resolves on its own within a few months of completing treatment.
Chronic radiation proctitis develops later — anywhere from three months to two or more years after radiation — and affects a smaller but meaningful share of people who’ve had pelvic radiation. It tends to involve more persistent rectal bleeding, diarrhea, and in some cases more serious complications like strictures or fistulas.
Why this overlaps with hemorrhoid symptoms
Both acute and chronic radiation proctitis can cause rectal bleeding, pain, and changes in bowel habits — the same core symptoms as a hemorrhoid flare. Adding to the overlap, people undergoing pelvic radiation who already have hemorrhoids can experience a genuine worsening of those hemorrhoid symptoms as an early effect of treatment, which can make it genuinely difficult, even for clinicians, to separate “your hemorrhoids got worse” from “this is radiation-related change” without a direct look.
Why the distinction matters
Standard hemorrhoid self-care doesn’t address radiation-related tissue changes, and chronic radiation proctitis has its own specific set of treatments (including endoscopic therapies like argon plasma coagulation, and other options depending on severity) that a gastroenterologist familiar with this condition would consider. Continuing indefinitely with hemorrhoid-focused self-care, when symptoms are actually radiation-related, delays the treatment that would help.
How it’s diagnosed
Diagnosis is made through direct visualization of the rectum (colonoscopy or flexible sigmoidoscopy), which can identify the specific tissue changes associated with radiation exposure and distinguish them from other causes like infection or inflammatory bowel disease.
When to see a doctor
- Any new or worsening rectal bleeding, pain, or bowel habit change during or after pelvic radiation treatment — even years afterward
- Symptoms that seem like a hemorrhoid flare but don’t respond to typical self-care, in the context of a radiation history
- Ongoing symptoms being managed as “just hemorrhoids” without ever being evaluated in light of a radiation history — this is worth raising directly with your oncology or gastroenterology team
This page is for general education. If you’ve had pelvic radiation therapy, mention any new anorectal symptoms to your oncology team or a gastroenterologist rather than assuming they’re unrelated or attributing them solely to hemorrhoids.