Menu Healthy Lifestyle Diseases & Conditions First Aid Symptoms Tests & Procedures Videos Definitions FAQs CarcinoidUpdated: 2017-06-13OverviewA carcinoid tumor is a type of slow-growing cancer that can arise in several places in the body. It often begins in the stomach, appendix, small intestine, colon, rectum, or lungs. SymptomsSymptoms often don't appear until late in the disease and are vague. Examples include diarrhea and skin flushing.TreatmentsTreatment includes surgery and medications. © 1998-2022 Mayo Foundation for Medical Education and Research(MFMER). All rights reserved. Terms of Use