What Is Colorectal Cancer Screening?

Colorectal cancer screening is a preventive medical approach designed to detect colorectal cancer or early abnormal changes in the colon before serious illness develops. In Singapore, colorectal cancer is one of the most common cancers, yet it is also one of the most preventable with timely screening.

Screening focuses on identifying early-stage cancer or precancerous changes, allowing intervention before symptoms worsen or cancer spreads. Colonoscopy is widely regarded as the most comprehensive method used in colorectal cancer screening.

How Does Colorectal Cancer Screening Work?

Colorectal cancer screening works by examining the colon for early abnormalities that may not yet cause discomfort or noticeable symptoms. These abnormalities can develop slowly over time, which is why regular screening is recommended even for individuals who feel well.

Colonoscopy screening allows doctors to directly visualise the entire colon and, when necessary, address abnormal findings during the same procedure. This proactive approach plays an important role in reducing the risk of colorectal cancer in Singapore.

Who Should Consider Colorectal Cancer Screening?

Screening is recommended for individuals at average and increased risk. In Singapore, colorectal cancer screening may be advised earlier for individuals with higher risk profiles. Factors that influence screening decisions include:

• Age 50 and above
• Family history of colorectal cancer
• Previous abnormal screening results or high-risk findings in the past
• Other risk factors such as diet, smoking, obesity or a history of inflammatory bowel disease

Screening Options for Colorectal Cancer

Colonoscopy Screening:

Colonoscopy is considered the gold standard for colorectal cancer screening. It allows a full examination of the colon and enables immediate treatment, such as removal of polyps, if abnormalities are detected.

In Singapore, colonoscopy screening is commonly performed under sedation, making the procedure comfortable and safe for most patients.

Stool-Based Screening Tests:

Some patients ask how accurate stool tests are for colorectal cancer screening. Stool based tests can detect hidden blood or abnormal markers in the stool, which may indicate possible colorectal disease. However, they are not diagnostic tests.

An abnormal stool test result generally requires a follow up colonoscopy to confirm the cause. While stool tests may be suitable for selected individuals, they do not replace colonoscopy for a comprehensive evaluation of the colon.

Prevention Through Screening and Lifestyle

Colorectal cancer screening is a key preventive strategy. When combined with healthy lifestyle habits, it supports long-term colorectal health. Ways to reduce colorectal cancer risk include:

• Attending recommended screening programmes
• Maintaining a high-fibre diet
• Exercising regularly
• Avoiding smoking and excessive alcohol intake

Understanding how to prevent colorectal cancer begins with proactive screening and early medical consultation.

Symptoms That Indicate Screening Is Needed?

Many patients associate colorectal cancer screening only with symptoms, but it is most effective before symptoms appear. However, certain colon cancer symptoms and signs of colon cancer may indicate the need for urgent screening:

• Rectal bleeding or blood in the stool
• Persistent changes in bowel habits
• Unexplained abdominal pain or discomfort
• Ongoing fatigue or unexplained weight loss

These symptoms do not always mean cancer, but colorectal cancer screening helps determine the cause early and guides appropriate treatment.