Norovirus is a contagious viral infection that primarily affects your gastrointestinal system. Norovirus symptoms typically last between one to three days, with most people recovering within 48 hours. Norovirus symptoms usually begin with sudden onset nausea, vomiting, diarrhea, and stomach cramps, often accompanied by fever and body aches. While symptoms are usually short-lived, dehydration can be a concern, especially for young children, older adults, and those with weakened immune systems. Understanding the typical duration of ...