Open pragmatic, descriptive single site study in adult patients with non-stenotic eosinophilic oesophagitis. To assess the clinical value of Capsule sponge in the assessment of treatment response in patients with known non-stenosing eosinophilic oesophagitis, as an alternative to gastroscopy in a real world setting. To assess patient preference for Capsule sponge or gastroscopy. All patients with non-stenosing eosinophilic oesophagitis who are reviewed in clinic that have not had reassessment of their oesophagus post treatment initiation or change in treatment will be offered Capsule sponge as an alternative to gastroscopy. A standardised clinical symptom questionnaire will be self-administered for 2w prior to clinic visits and Capsule sponge. Telephone triage for safety check and exclusion criteria by Capsule sponge nurse. A patient symptom questionnaire at the time of procedure by research nurse. A patient satisfaction survey will be delivered after the Capsule sponge procedure by Capsule sponge nurse. Cytological assessment of the Capsule sponge and eosinophil count and other markers of inflammation will be reported by Cyted. Clinic follow up will occur at approximately 6-8 weeks post Capsule sponge. Descriptive Changes in management as a result of the Capsule sponge findings and /or symptoms will be recorded by clinician.