How To Know if You Have the Flu
Your respiratory illness might be the flu if you have sudden onset of body aches, high fever, and respiratory symptoms, and your illness occurs during the usual flu season in the Northern Hemisphere. However, during this time, other respiratory illnesses can cause similar symptoms to the flu. In addition, influenza can also occur outside of the typical flu season. It is impossible to tell for sure if you have the flu based on symptoms alone. Doctors can perform tests to see if you have the flu if you are in the first few days of your illness.
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