<prompt> Most common presenting symptom of Zollinger -Ellison syndrome is:DiarrheaPainEsophageal symptomsFlushing  <response>: Zollinger -Ellison syndrome symptoms and their frequencies Pain 79-100, diarrhea 30-75, esophageal symptoms 31-56 and flushing is not a feature of this disease. Ref: Harrisons principles of internal medicine, 18th edition, Page: 3057 