Rapid gastric emptying, or dumping syndrome, happens when the lower end of the small intestine (jejunum) fills too quickly with undigested food from the stomach. "Early" dumping begins during or right after a meal. Symptoms of early dumping include nausea, vomiting, bloating, cramping, diarrhea, dizziness, and fatigue. "Late" dumping happens 1 to 3 hours after eating. Symptoms of late dumping include hypoglycemia, weakness, sweating, and dizziness. Many people have both types.
Sources
National Digestive Diseases Information Clearinghouse
