The lower intestinal tract; The irritable bowel syndrome; Inflammatory bowel diseases; Diarrhea, constipation, and rectal bleeding; Polyps and cancer of the colon; Diverticular, diverticulosis, and diverticulitis; Food allergies; The aging gut; Intestinal repercussions of other diseases; Medicines and the gut; Intestinal gas; Sexually transmitted bowel diseases; The abdominal pain without a name; Your gut feelings