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Early symptoms of stomach flu - What are the usual symptoms of stomach flu? Misnomer. This may be an infection, often a virus, characterized by diarrhea and vomiting. Repeated such episodes can often be due to bad diet.
Stomach Flu Facts: 1  Symptoms are vomiting and diarrhea. 2  It is caused by viruses. ( 3 Norovirus and rotavirus are common culprits.) It is viral gastroenteritis and is not related to influenza (the real flu). 4  The flu shot does no t protect against the stomach flu.