Most cases of diverticulitis are uncomplicated and can be treated at home with rest, dietary changes, and sometimes antibiotics. The approach depends on how severe your symptoms are: mild cases often resolve within a week with conservative care, while complicated cases involving abscesses or perforation require hospital-level intervention.
Mild Cases May Not Need Antibiotics
For decades, antibiotics were standard treatment for any diverticulitis flare. That’s changed. A meta-analysis of over 1,100 patients found no statistical difference between observation alone and antibiotic treatment when it came to resolution time, recurrence at one year (8.6% vs. 9.6%), progression to complicated disease, or need for surgery. The American Gastroenterological Association now recommends that antibiotics be used selectively rather than routinely in otherwise healthy people with mild uncomplicated diverticulitis.
What “selectively” means in practice: if you’re generally healthy, not immunocompromised, and your symptoms are manageable, your doctor may recommend a watchful approach with pain management, fluids, and dietary modification alone. This is a safe strategy supported by strong evidence.
Antibiotics are still necessary in specific situations. You should expect to receive them if you have a weakened immune system, if you’ve been vomiting, if your symptoms have lasted more than five days before you sought care, or if blood work and imaging show significant inflammation. They’re also mandatory when there’s an abscess, perforation, or bowel obstruction. A typical outpatient antibiotic course lasts 4 to 7 days.
What to Eat During a Flare
During the acute phase of a flare, the goal is to give your colon as little work as possible. Your doctor will likely start you on clear liquids or very easily digested foods. As symptoms improve, you can slowly transition to low-fiber options: canned or cooked fruits and vegetables without skins, seeds, or peels, along with strained vegetable or fruit juice without pulp. Avoid raw fruits and vegetables, cooked greens like spinach, peas, and corn during this phase.
This low-fiber approach is temporary. It’s the opposite of what you’ll want long-term. Once the flare resolves, gradually increasing your fiber intake is one of the most effective things you can do to prevent recurrence. Federal dietary guidelines recommend 14 grams of fiber per 1,000 calories, which works out to about 28 grams daily on a 2,000-calorie diet. A diet low in fiber and high in red meat is associated with increased diverticulitis risk, so the post-recovery period is a good time to shift both of those patterns.
Managing Pain Safely
Pain relief during a diverticulitis flare requires some caution. NSAIDs like ibuprofen and naproxen are a concern: a case-control study found that patients taking NSAIDs for four weeks or longer had roughly three times the risk of diverticular perforation compared to those who weren’t. The association is strong enough that NSAIDs are generally considered risky for anyone with known diverticular disease. Acetaminophen (Tylenol) is the safer alternative for managing pain during a flare. For more severe pain, your doctor can prescribe something stronger on a short-term basis.
When Abscesses Form
Sometimes diverticulitis produces an abscess, a walled-off pocket of infection near the colon. Small abscesses under 3 centimeters typically respond to antibiotics alone, with up to 70% of small abscesses resolving with conservative treatment. Larger abscesses, generally those over 3 to 5 centimeters depending on the guideline your hospital follows, usually require percutaneous drainage. This is a procedure where a radiologist inserts a thin tube through the skin to drain the infected fluid, guided by imaging. Most patients with abscesses need to be hospitalized.
If drainage and antibiotics fail, or if the abscess recurs, surgery becomes the next consideration.
When Surgery Is Needed
Emergency surgery is required when diverticulitis causes a free perforation with widespread infection in the abdominal cavity (peritonitis). This accounted for 57% of emergency operations in one large surgical study, with abscesses causing another 22% and bowel obstruction 11%.
Elective surgery, meaning planned and scheduled, comes into play for different reasons. The clearest indications are narrowing of the colon that causes blockage symptoms (40% of elective cases in the same study), fistulas where the inflamed colon creates an abnormal connection to the bladder or another organ (14%), and recurrent diverticular bleeding (7%). Recurrent attacks with ongoing symptoms accounted for 36% of elective surgeries. The procedure typically involves removing the affected segment of the sigmoid colon.
People on immunosuppressive medications, those with chronic kidney disease, or those with connective tissue disorders are at higher risk for dangerous complications and may benefit from earlier elective surgery after even a single conservatively treated episode.
Preventing Future Flares
After recovery, the priority shifts to reducing your chances of another episode. High-fiber eating is the cornerstone. Good sources include beans, lentils, whole grains, fruits, and vegetables. Increase fiber gradually over several weeks to avoid gas and bloating, and drink plenty of water alongside it.
Probiotics show some promise, though the evidence is still developing. In one trial, a specific strain of Lactobacillus casei combined with an anti-inflammatory medication reduced recurrence to 7.3% compared to 46% in controls. Another strain, Lactobacillus reuteri, showed faster improvement in abdominal pain scores. These results are encouraging but come from relatively small studies, so probiotics are best viewed as a potential complement to dietary changes rather than a standalone prevention strategy.
Regular physical activity and maintaining a healthy weight also appear to reduce diverticulitis risk. Cutting back on red meat, which research has linked to higher rates of diverticular inflammation, is another practical step you can take starting with your next meal.