A case of a young man with eosinophilic gastroenteritis with mucosal involvement in the antrum and duodenum is presented. The diagnosis was based on endoscopic biopsy with histological examination, peripheral blood eosinophilia and gastrointestinal symptoms, like abdominal cramping, nausea, vomiting and diarrhoea. Parasitic and extraintestinal diseases were ruled out. Steroid therapy was effective. It is emphasised that in the cases of abdominal complaints accompanied by eosinophilia, this rare disease should be considered.