Only patients at the first endoscopic diagnosis of diverticulosis/diverticular disease will be enrolled. For each patient, we recorded: age; severity of DICA score; severity of symptoms at entry and during the follow-up; C-reactive protein (CRP) and fecal calprotectin test at the time of diagnosis and during the follow-up (CRP only for DICA 2 and 3 patients); comorbidities (if any); concomitant therapies (if any); therapy taken during the follow-up to maintain remission (if any); months of follow-up; occurrence/recurrence of acute diverticulitis; need of surgery.