Apart from that, IBS-like symptoms in IBD remission meet the most typical features of true IBS on both a general (they are more common in females and are positively correlated with anxiety—a well-known trigger of IBS) and molecular level (in these patients, increased intestinal permeability, a higher number of TRPV1 nerve fibers and lower expression of tight junction proteins zonulin-1 and alpha catenin—generally typical for IBS—were observed) [2,78,96]. This evidence concerns the gene TRPV1 and irritable bowel syndrome.