When you picture the flu, you envision fever, chills, body aches and exhaustion. But what about vomiting and diarrhea? The response varies depending on the flu strain. Although seasonal flu (influenza) primarily invades the lungs and throat, some strains– particularly influenza B– can also trigger stomach-related symptoms, including nausea, vomiting and diarrhea. These are more common in children but occasionally affect adults as well. Stomach viruses like norovirus can also cause vomiting and diarrhea, so ...