What is diverticulitis. Mysterious digestive disease peaks during the summer.

Former UFC heavyweight champion Brock Lesnar has announced that he will not be participating in next month's title elimination fight due to a flare up of diverticulitis.
Diverticulitis is a mysterious digestive disease peaks during the summer. How to treat diverticulitis? Diverticulitis can be treated by eating more fiber, taking antibiotics, or by surgically removing part of the colon. What causes Diverticulitis?