Colorectal cancer is among the most preventable cancers, but far too many people remain unscreened. The majority of colorectal cancers develop from polyps, abnormal growths in the lining of the colon or rectum that are detectable and removable during a colonoscopy before they become cancerous. The window between a polyp developing and it becoming cancer is often years. Colorectal cancer screening with colonoscopy exists precisely to find and remove polyps during that window, before any symptoms appear and before any cancer develops.

The importance of screening comes down to early detection and prevention. Polyps that are identified and removed during screening never have the opportunity to develop into cancer. Left undetected, however, these polyps can continue to grow and potentially become malignant. When colorectal cancer is diagnosed at an early stage, the five-year survival rate exceeds 90%. Once the cancer has spread to distant organs, the five-year survival rate drops to less than 15%, highlighting the critical importance of timely screening. 

When Should Screening Colonoscopy Begin

The United States Preventive Services Task Force (USPSTF) and The American Cancer Society recommend that average-risk adults begin colorectal cancer screening at age 45. However, several factors warrant earlier screening, and all adults over 40 should have an active conversation with their physician about their specific risk profile and appropriate screening timeline.

Earlier screening is recommended for patients with a first-degree relative, meaning a parent or sibling, who was diagnosed with colorectal cancer or advanced adenomatous polyps before the age of 60. For these patients, screening typically begins at age 40 or ten years before the age at which the relative was diagnosed, whichever comes first.

Earlier screening is also recommended for patients with inflammatory bowel disease, including Crohn’s disease or ulcerative colitis, patients with a personal or family history of hereditary colorectal cancer syndromes such as Lynch syndrome or familial adenomatous polyposis, and patients with a previous history of colorectal polyps.

For average-risk patients who begin screening at 45 and have a normal colonoscopy with no polyps, the next recommended screening interval is 10 years. For patients in whom polyps are found, the interval depends on the number, size, and type of polyps removed. Your gastroenterologist will advise on the appropriate follow-up timeline based on your specific findings.

What a Colonoscopy Actually Involves

Many patients delay colonoscopy because they are uncertain what the procedure involves or because they have heard that the preparation is unpleasant. Understanding what actually happens demystifies the process and removes the barriers that lead to avoidance.

A colonoscopy is performed under sedation, meaning patients are typically given intravenous medication that produces a relaxed, sleep-like state during the procedure. The procedure itself involves the insertion of a colonoscope, a thin, flexible tube with a camera at the tip, into the rectum and through the entire length of the colon. The physician uses the camera to inspect the lining of the colon for polyps, inflammation, or other abnormalities. If polyps are found, they are typically removed during the same procedure using instruments passed through the colonoscope. The procedure usually takes between 30 and 60 minutes.

Because sedation is used, patients need to arrange for someone to drive them home afterward. Most patients are able to return to normal activities the following day.

For most patients, the bowel preparation is the most challenging part of the colonoscopy process. It involves following a clear liquid diet and taking a bowel-cleansing solution the day before the procedure to ensure the colon is completely clean for optimal visualization. Fortunately, bowel preparation options have improved significantly over the years, with lower-volume and better-tasting formulations now available. Many patients who postpone screening because of concerns about the prep are pleasantly surprised to find that the experience is much more manageable than they anticipated.

Symptoms That Warrant Evaluation Before Average Screening Age

A screening colonoscopy is intended for individuals without gastrointestinal symptoms and serves as a preventive tool to detect and remove precancerous polyps before they develop into cancer. However, anyone experiencing concerning symptoms should seek medical evaluation promptly, regardless of age or prior screening history.

Symptoms that warrant evaluation by a gastroenterologist or primary care physician include rectal bleeding or blood in the stool, persistent changes in bowel habits such as diarrhea, constipation, or altered stool caliber lasting more than a few weeks, ongoing abdominal pain or cramping, unexplained weight loss, and fatigue or weakness that may be related to iron deficiency anemia from occult gastrointestinal blood loss.

While these symptoms do not necessarily indicate colorectal cancer, they should never be ignored. Timely evaluation is important to identify the underlying cause and may require diagnostic testing such as colonoscopy or other gastrointestinal studies.

A Preventive Health Role

At Prime Institute, Dr. Michelle Pearlman approaches patient health from a comprehensive, preventive standpoint. This means helping patients understand not only their current health status but the screening and preventive measures that should be part of their healthcare timeline at every age.

At Prime Institute, colorectal cancer screening is a routine part of preventive health discussions for adults over age 40. Dr. Pearlman works closely with patients to assess their individual risk factors, review personal and family history, and determine the most appropriate screening strategy and timing based on current evidence-based guidelines. 

Preventive health care is not reactive. It is planned, intentional, and specific to each patient. Prime Institute is the right practice for patients in Miami who want a physician who takes their long-term health as seriously as they do.