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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.
Gastroenteritis is a better term because when some individuals use the term stomach flu , they get the term confused with the flu (influenza) and the viruses that cause the flu. Influenza viruses do not cause stomach flu. Gastroenteritis most commonly causes symptoms of. 1  diarrhea, 2  nausea, 3  vomiting and. 4  abdominal pain.