Blog GI Conditions

Diverticulosis and Diverticulitis: Symptoms, Treatment, and Prevention

Ken D. Nguyen, MD · Oct 23, 2026 · 1 min read

Diverticula are small pouches that bulge out through weak spots in the wall of the colon. Having them is called diverticulosis, and it is very common after age 50. Most people never have problems. When a pouch becomes inflamed or infected, it is called diverticulitis.

Symptoms of diverticulitis

  • Pain, usually in the lower left belly, that lasts for days
  • Fever
  • Nausea
  • Constipation or diarrhea

Get urgent care for severe pain, high fever, vomiting that prevents drinking, or heavy bleeding.

Diagnosis

A CT scan usually confirms diverticulitis and checks for complications such as an abscess. After recovery, a colonoscopy is often recommended if you have not had a recent one, to rule out other causes.

Treatment

  • Mild cases: clear liquids and rest at home, then a gradual return to normal food. Antibiotics are not always needed.
  • More severe cases: antibiotics, and sometimes a hospital stay
  • Complications or repeated attacks: drainage or surgery may be needed

Prevention

  • Eat a high-fiber diet: fruits, vegetables, beans, and whole grains
  • Stay active and keep a healthy weight
  • Don't smoke
  • Nuts, seeds, and popcorn are fine to eat

Bleeding from diverticulosis

Diverticula can sometimes bleed suddenly and painlessly. Any significant rectal bleeding needs prompt evaluation.

Make an appointment

Our gastroenterologists in Temple City care for patients from Arcadia, San Gabriel, Pasadena, Monrovia, Monterey Park, and across the San Gabriel Valley. We accept most PPO plans (see accepted insurances), and our doctors speak English, Vietnamese, and Mandarin. Schedule an appointment or call 626-898-4560.

This article is for general education and is not a substitute for medical advice. Talk with your doctor about your own health.

Quick Answers

Do I always need antibiotics for diverticulitis?

Not always. Some people with mild, uncomplicated diverticulitis recover with rest and liquids, but your doctor decides based on your symptoms and health.

Do I need to avoid nuts and seeds?

No. Studies show that nuts, seeds, and popcorn do not raise the risk of diverticulitis.

Do I need a colonoscopy after diverticulitis?

Often yes, if you have not had a recent high-quality colonoscopy, to make sure nothing else is causing the symptoms.

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