Inflammatory Bowel Disease (IBD) encompasses two major disorders: Ulcerative Colitis and Crohn's Disease. Ulcerative Colitis causes ulcers in the lining of the rectum and colon and typically starts between ages 15-30. Crohn's Disease causes inflammation of the digestive system from mouth to anus, often affecting the ileum, and seems to run in families. Common symptoms of both disorders include abdominal pain, diarrhea, and weight loss. Symptoms vary depending on the extent and severity of inflammation in the colon and rectum.