Flu: Flu is a common respiratory virus that is usually more severe than the common cold. Symptoms often include high fever, headache, fatigue, weakness, and exhaustion. Cold-like symptoms such as sore throat, runny nose, and stuffiness can also occur but are less common than in common cold.
Early diagnosis of flu often involves distinguishing flu from common cold,
which is not always easy, but is important because of newer antiviral medications for the flu.
There are numerous other less common conditions
that start out like the flu (see flu-like symptoms).
Flu: Influenza, or the flu, is a respiratory infection caused by a variety of flu viruses. The most familiar aspect of the flu is the way it can "knock you off your feet" as it sweeps through entire communities. 1
Researching symptoms of Flu: Further information about the symptoms of Flu is available including a list of symptoms of Flu, other diseases that might have similar symptoms in differential diagnosis of Flu, or alternatively return to research other symptoms in the symptom center.
Statistics and Flu:
Various sources and calculations are available in statistics about Flu,
prevalence and incidence statistics for Flu,
and you can also research other medical statistics in our statistics center.
1. excerpt from The Flu, NIAID Fact Sheet: NIAID
Last revision: May 30, 2003
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