Study to Evaluate the Epidemiology and the Characteristics "Omics" in Patients Recently Diagnosed of Inflammatory Bowel Disease in Spain

This is a prospective, observational, multicenter, population-based incidence cohort study which will enroll cases of inflammatory bowel disease IBD (Crohn´s disease CD, ulcerative colitis UC, or indeterminate colitis) diagnosed in adults over 18 months in Spain. In addition, each incident case that gave his/her informed consent, will be followed up for 12 months to determine changes in phenotype or disease location, the need for immunosuppressive and biologic treatments, and the need for hospital admissions and surgery during the first year after diagnosis. Also, samples of of blood, urine and stool will be collected during the first year after diagnosis