IBD is a common term for two chronic diseases, Crohn's disease (CD) and ulcerative colitis (UC). IBD occurs often between the ages of 20-30 years. There are about 25,000 people in Denmark with IBD and diseases incidence and prevalence has increased over the past 20 years [1]. In Denmark, the incidence of CD increased fourfold to 10 per 100,000 inhabitants per years and the incidence of UC doubled to 17 per 100,000 inhabitants per years [2]. Its causes are not completely known but it indicates an interaction between genetic and external factors.