Stomach Flu 2024. Stomach flu is highly contagious, causing diarrhea and vomiting. Here's what you need to know if you think you have the norovirus, commonly called the stomach flu or stomach bug, and how to prevent spreading the sickness.
It can be very unpleasant, but usually goes away in about 2 days. It’s caused by viruses that cause inflammation of the stomach and intestines.