Gastroenteritis Say: gas-tro-en-tuh-ry-tus Feeling sick to your stomach? It may be gastroenteritis, sometimes called stomach flu. This illness can make you feel nauseous and cause you to throw up and have diarrhea. Back to Articles Related Articles Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor. © 1995-2021 KidsHealth®. All rights reserved. Images provided by The Nemours Foundation, iStock, Getty Images, Veer, Shutterstock, and Clipart.com.