Stomach Flu Symptoms 2024 Adults. This can happen if a person contracts the virus but does not develop symptoms or only has mild symptoms. 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.

Norovirus, sometimes referred to as a stomach flu or stomach bug, is a common virus that’s highly contagious and spreads through tiny particles of feces or vomit and. If you went out for the evening and woke up with a sudden bad stomach, chances are you might be experiencing viral gastroenteritis.