Colorectal, Oesophageal and Stomach Cancer Screening

Medically written by
A/Prof Viraj Kariyawasam
MBBS, FRACP, MRCP, PhD
Gastroenterologist & Hepatologist
Associate Professor – Macquarie University
Head of IBD Service – Blacktown Hospital
Last reviewed: March 2026

1. What is Gastrointestinal Cancer Screening?

Gastrointestinal cancer screening aims to detect cancer or precancerous changes at an early stage, before symptoms develop. Early detection significantly improves treatment outcomes and survival.

Screening is most established for colorectal cancer, but selected individuals may also benefit from screening for oesophageal and stomach cancers based on risk factors.

2. Colorectal (Bowel) Cancer Screening

Colorectal cancer screening focuses on detecting early cancers and precancerous polyps in the colon and rectum. In Australia, this is primarily done using the faecal immunochemical test (iFOBT) as part of the National Bowel Cancer Screening Program.

People with a positive iFOBT or higher risk factors such as family history, inflammatory bowel disease, or previous polyps usually require colonoscopy. Colonoscopy is the most accurate test and allows removal of polyps to prevent cancer from developing.

3. Oesophageal Cancer Screening

Routine population screening for oesophageal cancer is not recommended. However, targeted surveillance is important in people at increased risk.

Individuals with long-standing gastro-oesophageal reflux disease (GORD), Barrett’s oesophagus, or additional risk factors such as smoking and obesity may require gastroscopy for surveillance. This allows early detection of precancerous changes before cancer develops.

4. Stomach (Gastric) Cancer Screening

Stomach cancer screening is not routinely performed in Australia for the general population due to low overall incidence.

Screening or surveillance may be recommended in higher-risk individuals, including those with Helicobacter pylori infection, a strong family history of stomach cancer, certain ethnic backgrounds, or chronic gastric inflammation. Gastroscopy allows direct inspection and biopsy when required.

5. Who Should Consider Screening?

Screening strategies depend on individual risk. Age, family history, medical conditions, lifestyle factors, and symptoms all influence recommendations.

People with persistent symptoms such as difficulty swallowing, unexplained weight loss, ongoing reflux, iron deficiency anaemia, or gastrointestinal bleeding should be investigated regardless of age.

6. Benefits of Early Detection

Cancers detected at an early stage are more likely to be treated successfully with less intensive therapy.

Detection and removal of precancerous lesions can prevent cancer altogether, particularly in the colon.

7. Prevention & Risk Reduction

Participation in recommended screening programs is one of the most effective ways to reduce cancer risk.

Maintaining a healthy weight, avoiding smoking, limiting alcohol intake, managing reflux symptoms, and treating Helicobacter pylori infection where present can reduce gastrointestinal cancer risk.

8. When to Seek Medical Advice

You should seek medical advice to discuss screening if you have a family history of gastrointestinal cancers, previous polyps, inflammatory bowel disease, or long-standing reflux symptoms.

Urgent review is recommended for red-flag symptoms such as difficulty swallowing, vomiting blood, black stools, persistent abdominal pain, unexplained weight loss, or iron deficiency anaemia.