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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.
Characteristics of Stomach Flu and Food Poisoning. Stomach flu: Stomach flu is caused by the infection of the GI tract, and the symptoms emerge one to two days after exposure to the virus and usually last for one- two days, however, in some cases, can last for up to 10 days.