Colon Cancer Screening: When to Start, What to Expect, and Why Early Detection Saves Lives

Colorectal cancer is the third most common cancer and the second leading cause of cancer death in the United States. The key fact: most colon cancers develop from precancerous polyps over 10-15 years — screening finds and removes them before they become cancer. Dr. Kalpit Devani, a board-certified gastroenterologist in Greenville, South Carolina, performs colonoscopy and helps patients understand when to start screening and what to expect.

Colon Cancer Is Preventable — But Only If You Get Screened

Colon cancer screening is the single most effective tool for prevention. Screening colonoscopy both detects and prevents colon cancer in the same procedure — polyps are removed before they can turn into cancer. Despite this, roughly one-third of eligible adults are not up to date on screening. Dr. Devani encourages patients to discuss screening with their primary care physician or gastroenterologist.

When Should You Start Screening?

The American Cancer Society and USMSTF recommend colon cancer screening starting at age 45 for average-risk adults (lowered from 50). High-risk individuals may need to start earlier: family history of colon cancer or advanced polyps in a first-degree relative — start at age 40 or 10 years before the youngest affected relative's diagnosis, whichever is earlier; personal history of inflammatory bowel disease; known hereditary syndromes (Lynch syndrome, familial adenomatous polyposis); prior personal history of polyps — surveillance interval depends on polyp number, size, and pathology. If you are unsure whether you need earlier screening, a gastroenterologist can assess your risk. Dr. Kalpit Devani evaluates patients for colonoscopy in Greenville SC.

What Happens During a Colonoscopy?

Preparation: a bowel preparation (cleansing solution) is taken the day before to clear the colon. Modern low-volume preps have made this more tolerable. The procedure itself takes approximately 20-30 minutes and is performed under sedation — most patients are asleep and feel nothing. A flexible camera is advanced through the entire colon. The physician examines the lining for polyps, masses, inflammation, or other abnormalities. If polyps are found, they are removed during the same procedure (polypectomy). After the procedure: patients recover for 30-60 minutes and go home the same day. Most resume normal activity the next day.

What If Polyps Are Found?

Not all polyps are the same. The pathology report determines the type and whether follow-up is needed. Hyperplastic polyps — generally benign, low risk. Adenomatous polyps (adenomas) — precancerous; removal eliminates the cancer risk from that polyp. Advanced adenomas (large, villous features, or high-grade dysplasia) — higher risk, require closer surveillance. Serrated polyps — increasingly recognized as a precancerous pathway. Surveillance colonoscopy intervals (typically 3-5 years) are determined by current USMSTF guidelines. Dr. Devani provides comprehensive gastroenterology care including polyp surveillance.

Symptoms That Should Not Be Ignored

Colon cancer in early stages often has no symptoms — this is exactly why screening matters. However, if you experience blood in the stool or rectal bleeding, persistent change in bowel habits lasting more than a few weeks, unexplained weight loss, iron deficiency anemia, or abdominal pain that does not resolve — see a gastroenterologist regardless of age. These symptoms do not always mean cancer, but they should always be evaluated.

For referrals or consultations regarding colon cancer screening, contact Dr. Devani.

Frequently Asked Questions

At what age should I get my first colonoscopy?

Current guidelines recommend starting at age 45 for average-risk adults. If you have a family history of colon cancer or other risk factors, you may need to start earlier. Consult a gastroenterologist to determine the right time.

Is a colonoscopy painful?

No. A colonoscopy is performed under sedation. Most patients are asleep during the procedure and do not feel any discomfort. The bowel preparation the day before is the most inconvenient part.

How often do I need a colonoscopy?

For average-risk adults with a normal colonoscopy and no polyps, the recommended interval is every 10 years. If polyps are found, the interval is shorter (typically 3-5 years) based on the type and number of polyps.

Are there alternatives to colonoscopy for screening?

Stool-based tests (such as FIT or Cologuard) are available for average-risk adults who prefer a non-invasive option. However, if any stool test is positive, a colonoscopy is required to follow up. Colonoscopy remains the most comprehensive screening method because it can detect and remove polyps in the same session.

This article is for educational purposes only and does not constitute medical advice. Please consult your physician for individualized care.