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