Background: In the North Denmark Region with a population of 580,000 the awareness of eosinophilic oesophagitis (EoE) increased after 2011 due to a regional biopsy guideline. However, very little was known of the incidence, diagnostic process, or complications of EoE in Denmark. Objective: The objectives of the study were to establish a cohort of EoE patients and describe the incidence, diagnostic process, and complications of EoE. Methods: Patient files and histology reports for the 308 DanEoE cohort of patients with eosinophilia in the oesophagus in 2007–2017 identified by the histopathology registry were analyzed. Results: The incidence of EoE in the North Denmark Region increased to 5.5–8.7/100,000 after 2011, where the regional biopsy guideline was implemented. The diagnostic delay was 10 (12) years for the EoE population. There was an insufficient number of biopsies sampled in 40 % of the patients. At the diagnostic endoscopy, the macroscopic appearance of the oesophagus was often described as normal (24%), and infrequently having one or more macroscopic signs of EoE (43%). Food bolus obstruction was observed in 38%, and strictures in 7.5% of EoE patients. In 22.2% of EoE patient's treatment was not initiated at debut. Conclusions: The EoE incidence was documented. The diagnostic process was analyzed and showed an unmet need for education among referring physicians and endoscopists: A diagnostic delay of a decade, infrequently noted macroscopic EoE changes and lack of treatment at the debut in one fifth. Strictures in the DanEoE cohort were rare whereas food bolus obstruction was frequent.