Intestinal blockage is a common complication of Crohn disease. ... occur when ulcers break through the intestinal wall to form passages ... ghr.nlm.nih.gov/condition/crohn-disease - External Health LinksIrritable Bowel Syndrome (IBS), Heartburn, Dyspepsia: what is the Difference? (International Foundation for Functional Gastrointestinal Disorders) - PDF ...