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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.
When a person becomes infected with a stomach flu virus (see Types of Stomach Flu Viruses) , it begins to multiply within the small intestine. After approximately one to ten days, stomach flu signs and symptoms can appear.This period between stomach flu transmission and the start of symptoms is the  stomach flu incubation period .. In some cases, this period can be as short as four hours.f stomach flu symptoms do occur, the illness begins suddenly. Common symptoms include: 1  Nausea. 2  Vomiting. 3  Watery diarrhea. 4  Abdominal cramping (stomach ache). 5  Abdominal (stomach) pain. 6  Dehydration.