Patients seen at the Center for Inflammatory Bowel Disease will be asked to provide their written informed consent (authorization) to allow their identifiable medical record information related to their Inflammatory Bowel Disease to be placed in Center's Research Registry for the purpose of facilitating retrospective research studies directed at Inflammatory Bowel Disease, and the identification and recruitment of potential, eligible subjects for participation in future research studies involving Inflammatory Bowel Disease. Information obtained from the Inflammatory Bowel Disease Registry will allow a better classification of disease and factors that influence the natural course of disease; which may lead to a better understanding of the pathogenesis of IBD and may permit the development of better therapies and the potential for preventive therapies.