This study did not receive the grant that was applied for to conduct the study.

A prospective longitudinal, observational study of adolescent and adults that will identify novel metabolites associated with dysphagia in Eosinophilic Esophagitis (EoE).

In this study, the investigators seek to understand whether a metabolomic profile obtained from esophageal samples correlate with the symptom of dysphagia in adolescent and adults. The investigators hypothesize that intraluminal secreted metabolite(s) will change during episodes of dysphagia. The aim of the study will be to use a novel method of producing esophageal luminal samples, the esophageal string test, to capture esophageal metabolites when a patient is and is not experiencing dysphagia.

Inclusion Criteria:

• Subjects with Eosinophilic Esophagitis (EoE) and seen either at Children's Hospital Colorado or University of Colorado Hospital for scheduled outpatient clinical assessment or upper GI endoscopy

Exclusion Criteria:

• Acute food impaction at time of study
• Recent (within 2 months) use of systemic steroids
• Other known esophageal disease or esophageal injury (e.g. tracheoesophageal fistula, congenital stricture, caustic injury)
• known other inflammatory bowel disease
• inability to swallow the EST