If your doctor orders you to have a colonoscopy, just tell him this…” — many viral posts online use this phrase to scare people away from an important medical test. But doctors say colonoscopy remains one of the most effective ways to detect and even prevent colorectal cancer.

A colonoscopy allows specialists to examine the inside of the colon and rectum using a small camera. During the procedure, doctors can also remove polyps before they become cancerous. According to the Mayo Clinic, this is one reason colonoscopy is considered a major tool in colorectal cancer prevention.

Medical experts recommend screening starting around age 45 for people at average risk, especially because colorectal cancer can develop silently without obvious symptoms in its early stages.

A colonoscopy may also help doctors investigate warning signs such as:
• Blood in the stool
• Persistent abdominal pain
• Unexplained weight loss
• Ongoing constipation or diarrhea
• Changes in bowel habits

Although some people fear the preparation or possible discomfort, specialists emphasize that the procedure is generally safe and can save lives through early detection. Like any medical procedure, there are small risks, but serious complications are uncommon.

Some newer at-home screening tests are available, but experts note that a positive result from those tests usually still requires a follow-up colonoscopy.

Instead of relying on misleading social media comments, health professionals encourage patients to discuss their personal risk factors, family history, and screening options directly with their doctor.

Sources: Mayo Clinic, Cleveland Clinic, Healthline.