
Eosinophilic esophagitis is an immune-mediated, chronic, inflammatory disease of the esophagus that was first recognized as a distinct entity less than three decades ago. The immunopathogenesis of the disease is characterized by type 2 helper T (Th2)–cell inflammation involving T cells, eosinophils, mast cells, and the cytokines interleukin-4, interleukin-5, interleukin-13, and thymic stromal lymphopoietin. These cells and mediators are potential targets for anti-inflammatory medications. As a result, the prevalence of eosinophilic esophagitis has increased rapidly. In Western countries, the disease currently affects approximately 1 in 3000 persons.
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