The following is an extract
IBS VERSUS COLITIS AND INFLAMMATORY BOWEL DISEASE (IBD)
The term "colitis" refers to colon inflammation and should not be used to refer to irritable bowel syndrome, because in IBS the colon is not actually inflamed. However, inflammation is found in several important disorders called inflammatory bowel diseases (IBD). The two types of IBD are ulcerative colitis, which affects the rectum and colon, and Crohn's disease, which can involve both the colon and the intestine. Nearly 1 million Americans suffer from IBD. Although the treatments for IBS and IBD differ, many people with IBD also have irritable bowel syndrome.
WHAT ABOUT DIVERTICULOSIS?
Diverticulosis is a very common disorder in which pockets develop in the colon because of increased colon spasm and pressure. Although the cause of this process is not really known, many people with diverticulosis have the same symptoms as do those with IBS.