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Diagnosis
To figure out if you have diverticulitis, your doctor will talk with you about your symptoms and do a physical exam. Next you may need one or more tests, such as a blood test, a computerized tomography (CT) scan, a barium enema or a colonoscopy. Doctors only diagnose diverticulitis after they rule out other illnesses that could cause the same symptoms.
Prevention
Eating a diet with plenty of fiber may help prevent diverticulitis. You get fiber when you eat fruits, vegetables and whole-grain foods. Be sure to talk with your doctor about how much fiber you need in your diet, and drink plenty of water or other liquids. Exercising and keeping your weight in a healthy range are also good choices to help prevent diverticulitis.
Additional Resources

Familydoctor.org
Learn more about diverticulitis from the American Academy of Family Physicians.