Stomach Flu 2024 Symptoms. Gastrointestinal infection that can be caused by a virus, bacterium, or parasite. The stomach flu is an infection that causes gastrointestinal symptoms including nausea, vomiting, and diarrhea.
Two physicians explain how to prevent and treat it. Norovirus is a highly contagious virus and a leading cause of gastroenteritis (inflammation of the stomach and intestines).
