Complications from diverticulitis occur in about 25 percent of cases; these may include: • An abscess (pus collects in the pouch) • A blockage in bowels caused by scarring • An abnormal passageway (fistula) in bowels • Peritonitis (infected or inflamed pouch ruptures) The complications of diverticulitis can be much more difficult to treat than the condition in its early stages, requiring more invasive procedures and longer recovery times; it is crucial to seek treatment as soon as possible in order to minimize the risk of complications.