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Is it the flu or norovirus? How to tell the difference This year's flu sometimes also includes gastrointesintal symptoms -- vomiting, stomach cramps, mild diarrhea -- on top of their respiratory symptoms. How to tell if you have flu or norovirus. At first blush, it seems fairly simple. The flu is an upper respiratory infection that causes sore throat, chills, body aches, runny nose, and coughing.…