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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.
The stomach âbugâ is usually a sickness caused by a virus which spreads from person to person or through food contamination. Symptoms usually appear 1 to 2 days after exposure. Symptoms are often mild and usually only last a day or two. You may experience some of the following symptoms: 1  Upset Stomach. 2  Diarrhea. 3  Vomiting. 4  Fever. 5  Headache. 6  Abdominal cramps.