Inflammatory bowel disease, or IBD, is a group of conditions where the digestive tract’s lining is inflamed. The two primary forms of IBD are Crohn's disease and ulcerative colitis in Crohn's disease. Inflammation can occur anywhere along the digestive tract. However, it’s usually located in the lower part of the small bowel and the upper colon ulcerative. Colitis inflammation typically occurs in the large intestine, including the rectum and the anus. Both main forms of IBD can cause bloating and gas.