# Bowel effects after pelvic radiotherapy (pelvic radiation disease): assessment and management

Source: https://onco.cc/protocols/pelvic-radiation-disease-bowel-symptoms/  
OnCo record `pelvic-radiation-disease-bowel-symptoms` (Protocol). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

Radiotherapy to the pelvis (for prostate, bladder, cervix, womb, rectal or anal cancer) can change how the bowel works for months or years: urgency, loose stools, wind, leakage or bleeding. Most of it has a cause that can be found and treated, often more than one, so ask for a proper assessment rather than being told it is just something to live with.

## Summary

The reference is the 2015 Frontline Gastroenterology guidance (Andreyev et al.), the algorithm used in the ORBIT randomised trial, in which an algorithmic approach helped and trained nurses managed patients as well as a gastroenterologist; 65 clinicians reviewed it and agreed 27 of 28 sections. Its principles: patients can have many symptoms at once, each with more than one cause, so investigate systematically and order all first-line tests at the first visit; irritable bowel syndrome is rarely the right diagnosis here; endoscopy or surgery in irradiated tissue carries more risk, and irradiated areas are not biopsied. Common treatable causes are bile acid malabsorption (SeHCAT; a sequestrant for moderate or severe), small intestinal bacterial overgrowth (breath test or aspirate), carbohydrate intolerance, exocrine pancreatic insufficiency after para-aortic fields, and pelvic floor dysfunction (at least six weeks of exercises). Faecal calprotectin is not recommended in this group. Bleeding from telangiectasia usually starts 6 to 12 months after treatment and settles by 8 to 10 years: reassure if it is not affecting life; otherwise stop anticoagulants if possible and consider sucralfate enemas, then hyperbaric oxygen (RCT support; MASCC/ISOO suggests it, level II), formalin or thermal ablation such as argon plasma coagulation, which the guidance says is absolutely contraindicated after brachytherapy. The ASGE (2019) found argon plasma coagulation and other endoscopic methods effective from small observational studies. MASCC/ISOO suggests Lactobacillus probiotics to prevent radiation diarrhoea (level III).

## Fields

- Kind: Protocol
- Last checked: 2026-11-11
- Also known as: pelvic radiation disease; radiation proctitis; radiation proctopathy; radiation enteritis; bowel problems after radiotherapy; late bowel effects of radiotherapy; rectal bleeding after radiotherapy; bile acid malabsorption after radiotherapy

## Connected records

- cancers: [Anal cancer (squamous cell carcinoma)](https://onco.cc/cancers/anal/), [Cervical cancer](https://onco.cc/cancers/cervical/), [Endometrial cancer](https://onco.cc/cancers/endometrial/), [Prostate cancer](https://onco.cc/cancers/prostate/), [Rectal cancer](https://onco.cc/cancers/rectal-cancer/)
- technologies: [Bowel function after pelvic radiotherapy](https://onco.cc/technologies/bowel-after-pelvic-radiotherapy/), [Hyperbaric oxygen for late radiation injury](https://onco.cc/technologies/hyperbaric-oxygen-radiation-injury/), [Pelvic floor rehabilitation after prostate and rectal surgery and after pelvic radiotherapy](https://onco.cc/technologies/rejuv-rehab-pelvic-floor/), [Probiotics for chemotherapy and radiotherapy diarrhoea](https://onco.cc/technologies/probiotics-treatment-diarrhoea/)
- key papers: [Hyperbaric oxygen therapy for late radiation tissue injury](https://onco.cc/key-papers/paper-bennett-cochrane-database-syst-rev/), [Probiotics for the prevention or treatment of chemotherapy- or radiotherapy-related diarrhoea in people with cancer](https://onco.cc/key-papers/paper-wei-cochrane-database-syst-rev/)
- ideas: [A nurse-led clinic for bowel problems after pelvic radiotherapy in every cancer centre](https://onco.cc/ideas/idea-pu-nurse-led-pelvic-radiation-disease-clinic/)

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