Colorectal Cancer & Polyps

Colorectal cancer usually begins as a polyp — a small, benign growth that takes years to become dangerous, if it ever does. That long runway is the whole story: caught early, this is one of the most treatable and preventable cancers there is. The catch is that early stages produce no symptoms, so detection depends on screening, not on feeling unwell.

What it is

Polyps are common growths on the colon’s inner lining — most people over 50 have at least one, and most polyps never become cancer. The ones that do transform slowly, typically over ten years or more. Screening works because of that timeline: find and remove polyps, or catch a cancer early, and outcomes change dramatically.

Signs and symptoms

Early colorectal cancer usually causes nothing you’d notice. Later signs include visible blood in stool, persistent changes in bowel habits, narrowing stools, unexplained weight loss, and ongoing abdominal discomfort. Any of these deserves a doctor’s visit regardless of age or screening history — and none of them should be waited out.

What you can track at home

Polyps and early cancers tend to bleed in amounts far too small to see. A fecal immunochemical test (FIT) detects that hidden blood — the same screening approach national programs use — from a simple sample at home. It’s a yearly habit, not a one-off: regular repetition is what gives FIT screening its power, and guidelines now recommend starting at 45.

When to see a doctor

A positive FIT result means one thing: schedule a conversation about colonoscopy, which can find and usually remove the source in the same procedure. Most positives turn out to be something less serious than cancer — hemorrhoids and small fissures bleed too — but the follow-up is what makes the screening meaningful. A family history of colorectal cancer or polyps is also a reason to talk timing with your doctor, possibly earlier than 45.