According to the American Society for Gastrointestinal Endoscopy, half of all people in the U.S. over age 60, and nearly everyone over age 80, has at least some diverticula in their colon. While diverticula are not always harmful, they can develop into a condition called diverticulitis if they become irritated. In this article, we will discuss what diverticulitis is, what symptoms it presents, and how it’s treated.