Stomach Flu September 2025. The stomach flu (gastroenteritis) is a nonspecific term for various inflammatory problems in the gastrointestinal (gi) tract. The most common symptoms of norovirus are diarrhea, vomiting, stomach pain, and nausea.

Find out more about gastroenteritis and ways it’s treated. What’s more, lots of viruses, like influenza and some others you might not.