What Is Diverticulitis?

Diverticulitis involves inflammation of outpouchings of the intestinal wall, a condition known as diverticulosis.

Risk factors for diverticulosis include being older than 65 years, obesity (body mass index [BMI] of 30 or more), high blood pressure, type 2 diabetes, certain medications (such as opioids, steroids, and nonsteroidal anti-inflammatory drugs [NSAIDs]), connective tissue diseases (such as polycystic kidney disease, Marfan syndrome, and Ehlers-Danlos syndrome), and specific genetic variants.1

By age 60 years, nearly 60% of people have diverticulosis, most often on the left side of the colon. About 1% to 4% of people with diverticulosis develop diverticulitis in their lifetime. Acute diverticulitis affects about 180 per 100 000 people in the US each year, resulting in approximately 200 000 hospitalizations annually.