Functional dyspepsia is a complex of disorders including pain or discomfort in the epigastric region, early satiety, nausea, vomiting, belching, heartburn and not caused by organic damage to the gastrointestinal tract. A feature of the syndrome in children is the predominant localization of pain in the umbilical region (55-88%); in 95% of children, pain occurs within the boundaries of a triangle, the base of which is the right costal arch, and the apex is the umbilical ring.