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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.
Quick Answer. Symptoms of a stomach bug or flu typically last from one to three days, according to WebMD, though they may last longer in some cases. Healthline indicates that some forms of stomach viruses may show symptoms for up to 10 days. Cramps, diarrhea and vomiting are the most severe symptoms.