Functional studies have showed the significant impacts of epigenetic changes on the IBD-related immunoregulation, maintenance of intestinal epithelial barrier, and modulation of autophagy, notably in the most extensively investigated filed such as T-cell differentiation, IL23/Th17 and STAT3 signaling pathways, and intestinal permeability, which further enhance our knowledge of the biological processes of IBD. Here, STAT3 is linked to irritable bowel syndrome.