Most cases of diverticulitis are uncomplicated and can be treated at home with dietary changes and, in some cases, antibiotics. About 75% of episodes resolve without complications, while the remaining 25% involve issues like abscesses or perforation that require more aggressive treatment. What you do during a flare and in the weeks after matters for both recovery and preventing recurrence.
Managing a Flare at Home
During an acute flare of uncomplicated diverticulitis, the first step is resting your digestive system. A clear liquid diet is recommended for the first few days. That means broth (chicken, beef, or vegetable), pulp-free fruit juices like apple or grape, water, tea or coffee without cream, gelatin, and ice pops without fruit bits. The goal is to reduce the workload on your colon while the inflammation settles.
Don’t stay on clear liquids for more than a few days unless your doctor specifically advises it. As your symptoms improve, you should start eating solid foods again, beginning with low-fiber options. During this transition, aim for roughly 10 to 15 grams of fiber per day. Think white rice, refined pasta, eggs, well-cooked vegetables without skins, and lean protein. If you can’t advance your diet within 3 to 5 days of starting treatment, that’s a signal to follow up with your doctor right away.
When Antibiotics Are Needed
The thinking on antibiotics for diverticulitis has shifted in recent years. Not every case requires them. For mild, uncomplicated flares in otherwise healthy people, some doctors now recommend a watch-and-wait approach with dietary management alone. Clinical guidelines from the American Gastroenterological Association support this selective approach, reserving antibiotics for cases with more significant symptoms or for patients with other health conditions that raise their risk of complications.
When antibiotics are prescribed, they typically target the mix of bacteria found in the colon. Treatment courses generally last several days, sometimes starting with intravenous antibiotics and transitioning to oral ones. Your doctor will determine the specific medication and duration based on how severe your symptoms are.
Pain Relief: What’s Safe and What’s Not
This is one area where the wrong choice can make things significantly worse. Common over-the-counter painkillers like ibuprofen and naproxen (NSAIDs) are associated with a roughly fourfold increase in the risk of perforated diverticular disease. Corticosteroids carry an even higher risk, with odds ratios between 5.7 and 7.8 in studies comparing users to non-users. Even opioid painkillers nearly double the risk of perforation.
Acetaminophen (Tylenol) is generally considered the safest option for managing pain during a flare. A heating pad on the abdomen can also help. If your pain is severe enough that acetaminophen isn’t controlling it, that’s worth a call to your doctor rather than reaching for stronger medications on your own.
Signs That Need Emergency Attention
Most flares don’t require hospitalization, but some do. The classic warning combination is lower abdominal pain with a fever above 100.8°F (38.2°C) and signs of peritonitis, which feels like severe, diffuse abdominal tenderness that worsens when you release pressure on your belly. If your pain persists despite staying hydrated and taking acetaminophen, or if you develop rebound tenderness (a sharp increase in pain when you let go after pressing on your abdomen), you need emergency evaluation.
Complicated diverticulitis involves an abscess, bowel perforation, obstruction, or fistula. Small abscesses under 4 cm can sometimes be managed without surgery using drainage and antibiotics. Larger abscesses, or any sign of pus or fecal matter leaking into the abdominal cavity, typically require emergency surgery. Patients who fail to improve with conservative management also become surgical candidates.
When Surgery Becomes Necessary
Emergency surgery is reserved for the most serious complications. If purulent or fecal peritonitis develops (meaning infected fluid or stool has leaked into the abdominal cavity), an emergent colectomy, removing the affected segment of colon, is the standard approach. In studies using a classification system that grades diverticulitis severity, patients with abscesses or worse required surgery over 55% of the time, compared to about 12% of those with only localized inflammation.
Elective surgery is a different conversation. After an episode of complicated diverticulitis, surgeons typically recommend removing the affected portion of the colon once you’ve fully recovered. For uncomplicated cases, even recurring ones, the decision is individualized. The old rule of recommending surgery after two episodes has largely been abandoned in favor of assessing each patient’s specific situation, including their age, overall health, and how significantly flares affect their quality of life.
Rebuilding Your Diet After Recovery
Once your flare has fully resolved, the dietary goal flips. You want to gradually increase fiber intake, adding high-fiber foods back one at a time until you reach 30 to 35 grams per day. This means whole grains, fruits, and cereals. Research shows that fruit fiber and cereal fiber are specifically associated with a lower risk of diverticulitis, though interestingly, vegetable fiber has not shown the same protective effect in studies.
One persistent myth deserves correction: nuts, seeds, and popcorn do not cause diverticulitis flares. The old theory was that small particles could lodge in the pouches (diverticula) and trigger inflammation. Research has found no evidence supporting this, and some studies actually show an inverse association, meaning people who eat nuts and popcorn have a lower risk of diverticulitis. There’s no reason to avoid these foods.
Reducing Your Risk of Recurrence
About 25% of people who have one episode of diverticulitis will have another. Diet is the most well-studied lever for prevention. A high intake of red meat and a Western dietary pattern (heavy on processed foods and refined grains) are associated with increased risk. Replacing just one daily serving of unprocessed red meat with poultry or fish is linked to a 20% reduction in diverticulitis risk.
It’s worth noting an honest nuance here: while a high-fiber diet is broadly recommended for general digestive health, the evidence that it specifically prevents recurrent diverticulitis is limited. European guidelines acknowledge this gap. That said, fiber clearly helps with the first episode risk and supports overall colon health, so most gastroenterologists still recommend it after recovery.
Regular physical activity also appears to be protective, though the evidence is less precisely quantified than for dietary changes. The combination of a fiber-rich diet, regular exercise, and limiting red meat represents the best-supported prevention strategy available.
Follow-up After a Flare
After an acute episode resolves, the American Gastroenterological Association recommends a colonoscopy 6 to 8 weeks later, or once symptoms have completely resolved, whichever takes longer. The purpose is twofold: to confirm the diverticulitis diagnosis and to rule out other conditions, particularly colorectal cancer, which can sometimes mimic diverticulitis on imaging. This follow-up is especially important if it’s your first episode or if you haven’t had a recent colonoscopy.