
Food Poisoning vs. Stomach Flu: How to Tell & When to Get Care
Food poisoning often starts within hours of eating contaminated food and may affect several people who ate the same thing. Stomach flu (viral gastroenteritis, often norovirus) usually starts 12 to 48 hours after exposure and spreads person to person. Both cause vomiting, diarrhea and cramps, and both usually improve in 1 to 3 days. Get care for signs of dehydration, bloody diarrhea, high fever, or symptoms lasting more than 2 to 3 days.
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