Known causes of<unk>  include: * Helicobacter pylori infection * Coeliac disease * Bacterial infection * Viral infection * NSAIDs * Autoimmune diseases (i.e. Crohn's disease) * Duodenal lymphocytosis * Idiopathic
Duodenitis
Heartburn
Duodenal cancer
Enterocolitis
Gastroenteritis
Ileus
Gastric varices
Gastroenterocolitis