Symptoms that happen when stomach contents move into the small bowel before being digested.

Gastric dumping syndrome is a group of symptoms that occur when undigested stomach contents move into the small bowel. The condition is more common in people who've had stomach removal or bypass surgery.

Cramps, nausea, diarrhea, and lightheadedness may occur soon after food is eaten.

Dietary changes, medication, and surgery can help.