What Are Colon Polyps?

Most people first meet the word "polyp" on a piece of paper. You've had a colonoscopy, you're waking up from the sedation, and the report says something like: "Two polyps found and removed." Nobody mentioned polyps beforehand, you felt nothing during the examination, and now you're left wondering what was actually inside you — and whether you should be worried. This guide walks through exactly that journey: what a polyp is, how it's found, what happens in the room when one is removed, and what the days and years afterwards usually look like.

The video at the top of this page is a good place to start. In just over four minutes, "Colon Polyp" lays out the basic facts plainly: polyps are growths on the inner lining of the colon, they are very common, and they matter because some of them may, over time, become cancerous — which is precisely why finding and removing them early is such a useful thing to do.

First, what a polyp actually is

Your colon — the large intestine — is lined with a smooth inner surface that renews itself constantly. Sometimes a small cluster of cells grows a little beyond that surface, forming a raised lump that projects into the bowel. That lump is a polyp. Some polyps are flat and spread out like a stain on the lining; others grow on a short stalk, more like a tiny mushroom. They vary from a few millimetres across to, occasionally, a few centimetres.

Here's the part that shapes everything else: a polyp is a description of a shape, not a diagnosis of danger. Polyps come in several types under the microscope. Some types are essentially harmless growths that never turn into anything. Others — the adenoma family is the one clinicians watch most closely — can change slowly over years and are the usual starting point for bowel cancer. You cannot tell which type a polyp is just by looking at it, which is why removed polyps are sent to a laboratory rather than judged in the room.

If you'd like the wider picture of the examination itself, our colonoscopy hub gathers the site's colonoscopy videos, guide and FAQs in one place.

Why you usually feel nothing at all

Here's what surprises most people: small polyps almost never cause symptoms. They don't hurt, they don't change how your bowel works in any way you'd notice, and they sit there quietly — which is exactly why screening exists. Polyps are usually found because someone went looking: a screening colonoscopy, a positive stool test that needed following up, or an examination done for another reason entirely.

Larger polyps can occasionally announce themselves — a little blood in the stool, a change in bowel habit that doesn't settle, or anaemia found on a blood test — and those symptoms always deserve assessment in their own right, whatever the cause turns out to be. But the typical story is the paper-report one: no warning, no symptoms, just a finding. Conditions that do cause bowel symptoms, such as diverticulitis, are a separate story — polyps are usually the silent ones.

The moment one is found: what happens in the room

During a colonoscopy, the clinician steers a flexible camera around the colon, inspecting the lining on the screen as they go. When a polyp appears, the usual move is to remove it there and then — you don't normally need a second procedure or an operation for this part. Small polyps may be taken off with tiny forceps or a wire loop; larger ones are commonly lifted slightly and cut away with a loop that seals the base as it cuts. The removed tissue goes into a pot, labelled, for the laboratory.

You can see the inspection side of this in our second video, "Chromoendoscopy of Colon Polyps" (1 minute 6 seconds), from Mohamed's channel. Chromoendoscopy means the lining is sprayed with a dye during the examination so that flat polyps and surface patterns stand out more clearly on the screen — a reminder that finding every polyp is partly about technique and a careful, unhurried look, not just about having a camera in place.

Because most people are sedated, the removal itself usually passes unnoticed; afterwards you may never know which part of the examination was inspection and which part was removal. Our guide to what a colonoscopy is and how it is done covers the preparation, the sedation, and the recovery in full, if you want that side of the day in detail.

Afterwards: the wait for the laboratory result

The polyp's story finishes in the laboratory, usually days after you've gone home and forgotten about the examination. Under the microscope, the pathologist answers the two questions that matter: what type of polyp was it, and was it completely removed? Most results come back reassuring — a benign type, fully removed, nothing further needed beyond routine follow-up. Some come back as adenomas, which is not a cancer diagnosis; it simply means that type of polyp had the potential to change over time, and removing it is what interrupted that path.

Occasionally, a result needs a further conversation — a very large polyp, one that couldn't be removed completely at the first attempt, or, uncommonly, early changes that need a treatment plan. If that happens, your team will explain what was found and what they propose, and that conversation is individual rather than something a general guide can script.

What follow-up usually looks like

Follow-up after polyps is personalised rather than one-size-fits-all. It depends on how many polyps were found, how large they were, and what type the laboratory said they were. Someone whose examination found only small, harmless-type polyps may simply return to routine screening intervals. Someone with several adenomas, or a large one, is usually invited back for a surveillance colonoscopy sooner, so any new polyps are caught while they're still small and simple to remove.

Two practical points are worth holding onto. First, keep your result letter — the recommended interval is written there, and it's based on your actual findings, not on a general rule. Second, a history of polyps is a reason to keep future screening appointments, not a reason to dread them: each clear surveillance examination is the system working exactly as intended, catching growths at the stage where removing them is a ten-minute job inside a routine examination.

And if you develop new symptoms in the meantime — bleeding, a lasting change in bowel habit, unexplained weight loss — don't wait for the next scheduled appointment. Mention them promptly; surveillance plans are built for the silent case, not as a reason to sit on symptoms.

Frequently Asked Questions

Do colon polyps always turn into cancer?

No. Most polyps never become cancerous, and some types essentially never do. Certain types, particularly adenomas, can change slowly over years, which is why they are removed when found — removal is what prevents that possibility from developing. The laboratory result on your own polyp tells you which type yours was.

Does removing a polyp hurt?

Most people feel nothing, because removal usually happens during the colonoscopy itself, under the same sedation as the examination. The inner lining of the colon doesn't sense cutting the way skin does, so the removal is typically discovered afterwards, on the report, rather than felt at the time.

Why was my polyp sent to a laboratory?

Because appearance alone can't settle what a polyp is. Even an experienced clinician can't be certain of the type just from the screen image, so removed polyps are examined under a microscope. That result decides whether anything further is needed and when you should be checked again.

If a polyp was found, will I need colonoscopies for life?

Not necessarily frequently, and the interval is tailored to you. It depends on the number, size, and type of polyps found. Some people return to routine screening intervals; others are invited back sooner for surveillance. Your result letter states the plan based on your own findings.

Can I prevent colon polyps?

You can't guarantee against them — age and family history play a part you can't change. What you can do is keep up with screening when it's offered to you, since screening is what catches polyps while they're silent and simple to remove, and mention a family history of bowel polyps or bowel cancer to your clinician, as it can affect when your own screening starts.

MedicalVideos.com has published trusted medical videos since 2007. The site was founded by Dr. Mohamed Ibrahim, MD, PhD — physician-scientist.

Educational only — this article is general information about colon polyps, not medical advice and not a diagnosis. Rectal bleeding, a lasting change in bowel habit, or unexplained weight loss should be assessed promptly in person by a clinician, whatever your screening history.