First, remember that the flu can cause mild to severe illness. Some people will get the flu and feel a little off, perhaps not even realizing they are sick. And obviously, for others it can be a life-or-death situation. 

The CDC points out that one major difference between the cold and flu is that the flu tends to come on rather suddenly. Often, symptoms include: 

Additionally, some people—generally children more than adults—may have vomiting and diarrhea. Thomas J. Mele, MD, FAAFP, Urgent Care Physician, Memorial Healthcare System points out that nausea and vomiting are also associated with those suffering influenza B, the strain that is dominant this flu season. 

While a fever is one of the more common flu symptoms, the CDC reminds us that not everyone with the flu will burn up. So, just because you have a normal body temperature doesn't mean you are flu-free. 

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