Is diverticulosis a sign of colon cancer?

No. Diverticulosis is a structural change in the colon wall, not a precancerous growth like a polyp. The concern about cancer applies after an episode of diverticulitis, because a tumor can look like diverticulitis on a CT scan. That is why guidelines advise a colonoscopy after many diverticulitis episodes.

Can diverticulosis go away?

The pouches do not usually go away once they form. They also do not need to be removed or treated if they cause no symptoms. The goal is to lower the chance of inflammation or bleeding through fiber, activity, a healthy weight, and not smoking.

Should I take a fiber supplement if I have diverticulosis?

Food is the preferred source. The AGA update notes that a fiber supplement is not a replacement for a high-quality diet. Some doctors do suggest fiber supplements for people with chronic symptoms, so ask your own doctor before starting one.

Is it safe to take ibuprofen with diverticulosis?

Regular use of NSAIDs such as ibuprofen and naproxen is linked to a higher risk of diverticulitis and its complications. Aspirin carries a smaller risk and should not be stopped if a doctor prescribed it for your heart. Ask your doctor which pain reliever fits you best.

Can diverticulosis cause bleeding without pain?

Yes. Diverticular bleeding happens when a small blood vessel in a pouch wall bursts, and it is a common cause of lower digestive tract bleeding. It can be severe. Any rectal bleeding after a diverticulosis finding needs prompt medical attention.

What Does It Mean If Your Colonoscopy Report Says Diverticulosis?

The short answer: Diverticulosis means your doctor saw small pouches bulging outward from the wall of your colon. It is a common finding, not a disease that needs treatment, and most people with it never have symptoms. Fewer than 5% go on to develop diverticulitis, the inflamed version. On its own, diverticulosis does not usually shorten the time until your next colonoscopy.

What exactly did the doctor see in your colon?

The report is describing structure, not an infection. According to the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), diverticulosis happens when small pouches form and push outward through weak spots in the colon wall.

One pouch is called a diverticulum. Several are called diverticula.
They form mostly in the sigmoid colon, the lower part of the colon on your left side.
Reports often add a location and a count, such as "scattered sigmoid diverticulosis" or "pancolonic diverticulosis." These words describe where the pouches are and how many there are.

The endoscopist sees the openings of these pouches as small dark holes in the lining. They are usually a side note on the report. The main result of a screening colonoscopy is still whether polyps or cancer were found. If polyps were removed, our guide to colon polyps explains what those findings mean.

Doctors do not know exactly why the pouches form. NIDDK lists genes, low-fiber diets high in red meat, low physical activity, obesity, smoking, and medicines such as NSAIDs and steroids as possible factors.

How common is diverticulosis at your age?

Very common, and more common with each decade. NIDDK reports these U.S. figures:

More than 30% of adults ages 50 to 59 have diverticulosis.
More than 70% of adults older than 80 have it.
Fewer than 5% of people with diverticulosis develop diverticulitis.

Since screening colonoscopy now starts at 45 for average-risk adults, many people first learn about their pouches from a screening report. Finding it at 50 or 60 puts you in very large company.

How is diverticulosis different from diverticulitis?

The two words differ by one syllable, but they describe different situations. MedlinePlus and NIDDK draw the line this way:

Diverticulosis: the pouches are present. Most people have no symptoms or problems.
Diverticulitis: one or more pouches become inflamed. It can come on suddenly and can cause serious problems.
Diverticular disease: the pouches cause chronic symptoms, bleeding, or diverticulitis.

Diverticulitis typically causes pain in the lower left belly, often with fever, chills, nausea, or a change in bowel habits. Complications can include an abscess, a fistula, a blockage, or a hole in the colon. NIDDK estimates about 200,000 U.S. hospital stays for diverticulitis each year. A separate problem, diverticular bleeding, accounts for about 71,000 more. That happens when a small blood vessel in a pouch wall bursts.

A colonoscopy report that says "diverticulosis" is not a diagnosis of diverticulitis. Doctors usually diagnose diverticulitis during an attack, often with a CT scan, not during a routine scope.

Does diverticulosis change when you need your next colonoscopy?

Usually not. The follow-up interval is set by what else the doctor found, mainly polyps. The 2020 U.S. Multi-Society Task Force update recommends repeat colonoscopy 10 years after a normal exam in average-risk adults. Its polyp-based intervals do not list diverticulosis as a factor. If polyps were removed, see our guide to colonoscopy intervals after polyps.

Diverticulitis is a different story. The 2021 American Gastroenterological Association (AGA) clinical practice update on diverticulitis gives this advice:

Colonoscopy is advised after an episode of complicated diverticulitis.
It is also advised after a first episode of uncomplicated diverticulitis, but may be deferred if you had a high-quality colonoscopy within the past year.
After an acute attack, colonoscopy should wait 6 to 8 weeks or until symptoms fully resolve, whichever is longer. It may happen sooner if alarm symptoms are present.

The reason is that cancer can be mistaken for diverticulitis on a scan. The AGA update cites a meta-analysis of 31 studies in which colon cancer was found in 1.9% of patients with diverticulitis. The rate was 7.9% after complicated diverticulitis and 1.3% after uncomplicated episodes.

Should you change your diet, and do you need to avoid nuts, seeds, and popcorn?

You do not need a special diet for diverticulosis alone. Diet matters more for lowering the chance of diverticulitis. NIDDK says research links a diet low in fiber and high in red meat to a higher risk of diverticulitis. Eating more fiber and less red meat may lower that risk.

The Dietary Guidelines cited by NIDDK suggest 14 grams of fiber per 1,000 calories, or about 28 grams a day on a 2,000-calorie diet.
Good sources include beans, lentils, peas, raspberries, apples with the skin, and whole grains.
Health professionals often suggest adding fiber a little at a time so your gut can adjust.

The old advice to avoid nuts, seeds, corn, and popcorn has not held up. A 2008 JAMA study followed 47,228 U.S. men for 18 years. Men who ate nuts or popcorn at least twice a week did not have more diverticulitis or bleeding. Popcorn eaters had a lower diverticulitis risk (hazard ratio 0.72). The AGA update also states that nuts, corn, popcorn, and fruits with small seeds such as strawberries and blueberries are not linked to diverticulitis risk. NIDDK now says most people with diverticulosis do not need to avoid specific foods.

The AGA update also advises a high-quality diet, a normal body weight, regular physical activity, not smoking, and avoiding non-aspirin NSAIDs to lower the risk of recurrence. For help reaching a daily fiber goal, calories.md covers food-by-food nutrition basics.

When should you call a doctor?

Most people with diverticulosis never need to. Call your doctor, or seek urgent care, if you notice any of these, based on NIDDK and MedlinePlus:

Pain in the lower abdomen, especially the lower left side, that is severe or keeps getting worse.
Fever or chills along with belly pain.
Nausea or vomiting with belly pain.
Blood in the stool or bleeding from the rectum. Diverticular bleeding can be severe.
Ongoing bloating, cramping, constipation, or diarrhea. These can also come from other conditions such as irritable bowel syndrome.

Mild gas and bloating right after a colonoscopy are usually from air used during the exam, not your diverticula. Our guide to pain and bloating after colonoscopy explains which symptoms are expected. Severe pain, fever, or heavy bleeding after the procedure needs a call to the endoscopy team the same day.

The bottom line

Diverticulosis on a colonoscopy report means small pouches in the colon wall. It is found in more than 30% of people in their 50s and more than 70% of people over 80. Most people never have problems from it. It does not usually change your next colonoscopy date, which depends on polyps. Eat plenty of fiber, and you do not need to avoid nuts, seeds, or popcorn. Call a doctor for lower-left belly pain with fever, or for rectal bleeding.

Last updated: September 2026. This article is for informational purposes only and does not constitute medical advice. Talk with your gastroenterologist about what your own colonoscopy report means for your follow-up and diet.