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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.
Research Deeper: More About These Symptoms. 1  Flu-like symptoms Flu-like symptoms: Causes. 2  Stomach cramps Introduction: Stomach cramps. 3  Sudden onset of watery diarrhoea Introduction: Sudden onset of watery diarrhoea. 4  General Information: Other Possible Causes.