Most people are not aware that they even have a polyp in their colon until it is discovered at the time of a routine colon exam. Polyps rarely present any symptoms, and diagnosis is usually made by chance. Once you hear the term "polyp," it's only natural to get anxious, but don't assume that means you have cancer. Most colon polyps are not cancerous. But if they are not removed, some types can grow into colorectal cancer. For that reason, doctors typically remove polyps, even when they don't cause any symptoms.
What is a colon polyp?
Small growths on the lining of the colon or rectum. Sometimes flat, sometimes sitting on a little stalk. Size varies widely, from a few millimeters to something much bigger.
Doctors sort them into types:
Adenomatous polyps (adenomas): They are most likely to turn cancerous, though most still don't
Serrated polyps: The bigger ones, especially higher up in the colon, carry more risk
Hyperplastic polyps: usually small, rarely turn into anything
So can they become cancer
Yes, but risk isn't the same across the board. When it does happen, it's slow, usually years. It gives doctors a wide window to catch it during screening before it ever becomes cancer.
Doctors weigh a few things when figuring out risk:
What type of polyp is it
How big is it
How many are present
Whether the cells look abnormal under a microscope
Symptoms
Small ones, basically never. Most people only find out during a screening. Bigger polyps sometimes cause:
Blood in the stool
Rectal bleeding
Bowel habits changing for weeks at a time
Constipation or diarrhea that won't quit
Abdominal pain or cramping
Anemia that shows up with no obvious cause
None of these automatically mean polyps; they could be a dozen other things. Your doctor will run tests to figure out what's going on.
How they get diagnosed
Colonoscopy is the gold standard here. A thin scope with a camera; the doctor looks around the colon directly. If something turns up, it usually gets removed right then; no second procedure is needed. The tissue goes to a lab afterward to confirm the type and check for cancer cells. Stool tests and CT colonography can hint that something's there, but a colonoscopy is still what confirms it.
How they're treated
Removal during colonoscopy, called a polypectomy, handles most cases, especially smaller ones. Occasionally, a polyp is too large or awkward to remove that way safely, and surgery becomes the better option. Once the lab results are back, your doctor will tell you when to come back for the next colonoscopy. Timing depends on what was found, how big it was, and how many there were.
Can you lower your risk?
Not entirely. But a few things help: more fruits, vegetables, and whole grains; less processed and red meat; staying active; keeping a healthy weight; skipping cigarettes; cutting back on alcohol and keeping up with recommended screenings
A polyp isn't a cancer diagnosis, and most never become one. The ones that do take years to get there are exactly why screening works so well. Catch it early, remove it, and colorectal cancer often never gets the chance to start.