Current Stomach Flu Symptoms 2024. Norovirus is often referred to colloquially as the stomach flu, but it is not related to influenza. Commonly called the “stomach bug” or “stomach flu,” norovirus is the leading cause of vomiting and diarrhea from acute gastroenteritis, which is inflammation of the stomach and intestines.

The highly contagious virus generally causes gastrointestinal symptoms like vomiting, nausea,. The norovirus, aka the stomach flu, is continuing to circulate, causing more cases in the u.s.