Eosinophilic oesophagitis (EoE) is a chronic immune-/antigen mediated disease. The classic adult patient with EoE is a young man presenting with intermittent dysphagia. Upper endoscopy is normal in up to 60%. The diagnosis requires: 1) symptoms of oesophageal dysfunction, 2) histology with eosinophilic inflammation, 3) effect of relevant treatment, and 4) no other causes of the histological changes. The disease can be treated by diet, local steroids or careful dilatation. This review will describe the disease in adults from the international consensus published in 2007 and 2011.