Eosinophilic Esophagitis (EE) is a chronic, T-helper 2 cell (TH2) - type inflammatory disorder of the esophagus with a rapidly increasing prevalence. Studies analyzing the natural course of EE provide strong evidence, that the chronic inflammation leads to irreversible structural changes in the esophagus with a loss of the mucosal elasticity and a fibrosis of the sub-epithelial esophageal layers with a concomitant risk of impairment in function.