Dumping syndrome occurs when the stomach empties its contents into the small intestine too quickly. The most common cause of dumping syndrome is stomach surgery: the stomach may empty too quickly after surgery.

Surgical procedures that can cause dumping syndrome include:

• Gastrectomy:
• Removal of a portion of the stomach
• Pyloroplasty:
• Opening the passageway between the stomach and the small intestine
• Vagotomy:
• Cutting the nerves that supply the stomach