Zollinger-Ellison syndrome (ZES) : · Stomach bleeding : · Gastroparesis (delayed gastric emptying) : · Obstruction by masses in the lumen ( foreign bodies , bezoar , gallstones . · Gastroesophageal reflux: · Gastroesophageal reflux disease (GERD): · Infectious diseases Giardiasis Ascariasis Tropical sprue Tape worm ( Diphyllobothrium latum , Taenia