Mark Evers, MD, Markey Cancer Center, University of Kentucky Reviewed / Revised Apr 2022 | Modified Sep 2022 View Patient Education Etiology Pathophysiology Symptoms and Signs Diagnosis Prognosis Treatment Key Points More Information Topic Resources Carcinoid Syndrome (Facial... Carcinoid syndrome develops in some people with carcinoid tumors and is characterized by cutaneous flushing, abdominal cramps, and diarrhea.