Hello, I am not sure if it is part of the "syndrome", but I started out years ago with IBS-C, and now am IBS-C/D with diverticulosus(diverticulitis is when the diverticula are infected and/or inflamed). I believe that the diverticula pockets are formed from too much straining to have a bowel movement, thus weakening the bowel wall. Whatever the cause, it sucks!!! Good luck to you and God Bless. Chris