Twenty-five patients with "postgastrectomy" syndromes were treated with surgical measures. Eleven with dumping syndrome received pouch-type (two) procedures or precedures at least partially involving reversed jejunal segment (nine). Results in the latter were good or excellent in all but one. Nine patients with afferent loop obstruction, treated by various methods for altering the disordered mechanisms, were relieved of the mechanical disorder. In seven of the nine the clinical results were good or excellent. Four patients treated for postvagotomy diarrhea by a reversed jejunal segment experienced good or excellent results. One patient with postvagotomy diarrhea treated by a reversed ileal segment did not.