Mild Diverticulitis: Do You Need Antibiotics, a Colonoscopy or Surgery?

Diverticulitis is inflammation of small pouches in the colon wall, usually causing pain in the lower left belly. It can come back unpredictably and sometimes leaves lingering symptoms.¹ Our guide to what diverticulitis is covers the basics. Here’s how expert advice on treatment has shifted.

Diagnosis

A CT scan is often needed to confirm diverticulitis and check for complications.¹ Rarely, colon cancer is mistaken for diverticulitis, which is one reason follow-up matters.¹

Antibiotics: not always needed

The American Gastroenterological Association’s expert review says antibiotics can be used selectively rather than routinely for mild, uncomplicated diverticulitis in people with a healthy immune system.¹ If your immune system is weakened, antibiotics are strongly advised.¹

In the Dutch DIABOLO trial, 528 people with CT-confirmed, uncomplicated first-time diverticulitis were assigned to observation or antibiotics.² At two years:²

Outcome	Observation	Antibiotics
Came back	15.4%	14.9%
Complicated flare	4.8%	3.3%
Colon surgery	9.0%	5.0%

None of these differences was statistically significant, but the authors noted the trial wasn’t designed to detect small differences in these outcomes.²

Colonoscopy afterward

Whether you need one depends on your history, your last colonoscopy, and how severe the episode was.¹ If symptoms linger, other causes should be ruled out with imaging and a scope.¹ Our article on colonoscopy after 75 covers age-related screening decisions.

Surgery: not by counting flares

Surgery to remove part of the colon shouldn’t be recommended just because of the number of episodes.¹ It should depend on severity, your preferences and the risks and benefits.¹ The risk of a complicated flare is highest with the first episode.¹

Lowering the chance of another flare

The review suggests a high-quality diet, a healthy weight, staying active, not smoking, and avoiding NSAID pain relievers (except aspirin prescribed for heart protection).¹ Genes play a part too.¹

Questions to ask

1. Is my case uncomplicated, and do I need antibiotics?
2. What signs should send me back or to the emergency room?
3. Do I need a colonoscopy, and when?
4. What should I use for pain instead of NSAIDs?

Try: “The CT shows mild diverticulitis. Can I recover without antibiotics, and what symptoms mean I should come back?”

Bloated by Dinner includes a Belly Clock log and a Test-It list with a visit script. Use them to track pain, fever and bowel changes during recovery. See the book.