When it comes to health screenings, few procedures are as misunderstood or avoided as the colonoscopy. Whether it’s due to embarrassment, fear, or the perception that it’s unnecessary, many people delay this potentially life-saving test. But here’s the truth: colorectal cancer is one of the most preventable and treatable forms of cancer, if caught early.
Colonoscopies are not just for people who already have symptoms. By the time symptoms appear, the cancer may have already advanced. That’s why early and regular screening is crucial, particularly for those aged 45 and above, or individuals with a family history of colorectal cancer.
The rising threat of colorectal cancer
Colorectal cancer, which includes cancers of the colon and rectum, is the third most common cancer worldwide and the second leading cause of cancer-related deaths. In Singapore alone, it remains one of the top three cancers affecting both men and women.
One of the most troubling trends in recent years is the increase in colorectal cancer among younger adults, prompting medical organizations like the American Cancer Society to lower the recommended screening age from 50 to 45. Delaying a colonoscopy could mean missing the chance to detect and remove precancerous growths before they become life-threatening.
Why does early detection matter?
Colorectal cancer usually begins as small, noncancerous polyps (growths on the inner lining of the colon or rectum). These polyps can take 10 to 15 years to develop into cancer, giving doctors a long window of opportunity to find and remove them.
A colonoscopy allows doctors to:
- Spot and remove polyps before they become cancerous
- Detect cancer early, when it’s most treatable
- Monitor the colon in people with higher genetic risk
When detected early, the five-year survival rate is over 90%. But if detected late, that rate drops significantly. This stark difference highlights the life-saving potential of regular screening.
Who should get screened?
You should consider a colonoscopy if you fall into any of the following categories:
Aged 45 or Older
Even if you have no symptoms or family history, screening is recommended starting at age 45. This is because most colorectal cancers develop silently and gradually over time.
Family History of Colorectal Cancer
If a parent, sibling, or child has had colorectal cancer, your risk doubles or triples. In such cases, you may need to begin screening earlier, sometimes as young as 40 or even 10 years before your relative was diagnosed.
History of Polyps or Inflammatory Bowel Disease
If you’ve had polyps removed in the past, or if you suffer from conditions like ulcerative colitis or Crohn’s disease, regular surveillance is critical.
Symptoms (even if occasional or mild)
Don’t ignore warning signs like:
- Blood in stool
- Persistent abdominal discomfort
- Unexplained weight loss
- Change in bowel habits
These symptoms warrant immediate medical attention, regardless of age.
What happens during a colonoscopy?
A colonoscopy is a low-risk outpatient procedure performed under sedation. A thin, flexible tube with a camera (colonoscope) is inserted through the rectum to examine the colon. The process usually takes 20 to 30 minutes, and most people do not remember the procedure due to the sedative.
If polyps are found, they are typically removed during the procedure. This makes colonoscopy not just a diagnostic test, but also a preventive treatment.
How to prepare for the procedure?
The most challenging part of a colonoscopy is often the preparation. To ensure a clear view, you’ll need to follow a liquid diet for 1–2 days and take a prescribed laxative to clean out your bowels. While not pleasant, it’s a small inconvenience compared to the benefits of detecting cancer early or avoiding it altogether.
Overcoming fear and procrastination
It’s completely normal to feel anxious about a colonoscopy. But many fears are based on misconceptions:
- “It’s painful.” Most people report little to no discomfort due to sedation.
- “I’m too young to worry.” Colon cancer is increasingly affecting adults in their 30s and 40s.
- “I have no symptoms, so I’m fine.” Early-stage colon cancer rarely shows symptoms.
If you’re still hesitant, talk to your doctor. They can explain your risks, walk you through the procedure, and offer alternatives such as stool-based tests. However, colonoscopy remains the gold standard for accuracy and prevention.
Knowledge is power
Think of a colonoscopy not as something to fear, but as a powerful tool in your health toolkit. It provides peace of mind, helps you take control of your health, and could save your life.
If you’re over 45 or have a family history of colon cancer, don’t wait for symptoms to appear. Schedule your colonoscopy today—because early detection is not just an option, it’s a lifesaver.
Too many people delay their first colonoscopy out of fear, embarrassment, or a belief that it’s unnecessary. But the truth is clear: colorectal cancer is highly preventable and treatable when caught early.
By taking action now, you’re not just investing in your health—you may be saving your life.