Most cases of diverticulitis are mild and resolve within about a week with rest, dietary changes, and sometimes antibiotics. There is no permanent cure that eliminates the pouches (diverticula) already formed in the colon wall, but you can treat flare-ups effectively and significantly reduce the chance they come back. In complicated cases involving abscesses, perforations, or fistulas, surgery may be needed.
Uncomplicated vs. Complicated Diverticulitis
How your diverticulitis gets treated depends almost entirely on which category it falls into. Uncomplicated diverticulitis means the inflamed pouches haven’t caused any structural damage. Even a tiny, contained microperforation with a small amount of air leaking outside the colon is still considered uncomplicated as long as your body isn’t mounting a major inflammatory response. This is the most common scenario.
Complicated diverticulitis involves a more serious problem: a larger perforation, an abscess (a walled-off pocket of pus), a fistula (an abnormal tunnel between the colon and another organ like the bladder), a stricture that narrows the colon, or a bowel obstruction. These complications change both the urgency and the type of treatment you’ll need.
Treating a Mild Flare-Up at Home
If your case is mild and uncomplicated, you may not even need antibiotics. A meta-analysis of nine studies involving over 2,500 patients with uncomplicated diverticulitis found no difference in recovery time, complication rates, readmission, or need for surgery between patients who took antibiotics and those who didn’t. The American Gastroenterological Association now recommends using antibiotics selectively rather than routinely for immunocompetent patients with mild, uncomplicated cases.
That said, antibiotics are still recommended if you have other health conditions, a weakened immune system, symptoms lasting more than five days before you sought care, vomiting, or signs of higher inflammation on blood work. When antibiotics are prescribed, the course typically lasts four to seven days.
During a flare, your doctor will likely ask you to start with clear liquids only for a few days to give your digestive tract a chance to rest. As pain improves, you’ll gradually add low-fiber, easy-to-digest foods, aiming for five to six small meals a day with about one to two ounces of protein per meal. Most people feel significantly better within a week.
When Surgery Becomes Necessary
Surgery is reserved for complicated cases or for people whose quality of life is severely affected by repeated flare-ups. The most common procedure removes the diseased segment of the colon, usually the sigmoid colon, and reconnects the healthy ends.
There’s no universal rule about how many flare-ups trigger a surgical recommendation. The decision depends on how severe each episode was, whether complications developed, your age, your overall health, and how much the condition disrupts your daily life. If diverticulitis creates a fistula between the colon and bladder (which can cause gas or stool in your urine), or causes a bowel obstruction with nausea, vomiting, and abdominal distension, surgery is more strongly considered. Signs of sepsis, including fever spikes, temperature drops, or altered consciousness, warrant same-day hospital evaluation.
Only about 5% of uncomplicated cases progress to complicated diverticulitis during a given episode. But emergency surgery for perforation or uncontrolled infection, while uncommon, carries significantly more risk than a planned elective procedure.
Recurrence Is More Common Than Expected
One of the most important things to understand about diverticulitis is that having one episode raises your odds of having another. A study tracking patients for a full decade after their first uncomplicated episode found that nearly half (48.6%) experienced at least one recurrence. About one in five of those who had recurrences went on to have four or more episodes. These numbers are higher than older estimates suggested, which is why long-term prevention matters so much.
Fiber Is the Foundation of Prevention
Once your flare has fully healed, your long-term strategy flips: you want to increase fiber, not restrict it. A high-fiber diet keeps stool soft and moving through the colon, reducing the pressure that inflames diverticula. The general recommendation is about 14 grams of fiber per 1,000 calories you eat, which works out to roughly 28 grams a day on a standard 2,000-calorie diet. Good sources include whole grains, fruits, vegetables, and beans.
If you’re not used to eating much fiber, increase your intake gradually over a few weeks. A sudden jump can cause bloating and gas. Drinking plenty of water alongside fiber is essential, since fiber absorbs water to do its job. If you take a fiber supplement, hydration becomes even more important to avoid making constipation worse.
Nuts, Seeds, and Popcorn Are Fine
For decades, people with diverticular disease were told to avoid nuts, seeds, and popcorn based on the theory that small particles could lodge inside the pouches and trigger inflammation. There is no evidence this is true. These foods are not linked to diverticulitis flare-ups, and many of them are actually good sources of fiber.
Other Lifestyle Factors That Help
Regular physical activity keeps your bowels moving and reduces the strain that contributes to flare-ups. Even light daily exercise like walking or yoga makes a meaningful difference. Smoking increases the risk of diverticular complications, including bleeding and inflammation, so quitting is one of the more impactful changes you can make. Obesity is another independent risk factor, and maintaining a healthy weight through diet and movement compounds the protective effects of the other changes.
Staying well hydrated rounds out the picture. Water, clear fluids, and vegetable juice all help keep stool soft. Combined with adequate fiber, consistent hydration, regular exercise, and not smoking, you give yourself the best realistic chance of keeping flare-ups from coming back.