Identification of Factors ASsociaTed With a Delayed Diagnosis in Crohn's Disease

The goal of this observational study is to determine the factors associated with a delayed diagnosis and/or an immediately complicated disease for CD patients. A questionnaire will be completed by the patients, each questionnaire has a patient section and a physician section.

Number of patients expected : at least 600, coming from all types of practices (ANGH (expert hospitals), GETAID (expert university hospitals) and CREGG (expert private practice)). Recruitment period : 1 year Primary endpoint : The primary endpoint is the description of the factors linked to: * The IBD * The patient (see patient questionnaire in annex 1) * The health care system * The patient's self-care Secondary endpoint : * Validation of the "red flags" in a prospective cohort. * Comparison with the EPIMAD population, especially the location and severity.