Influenza is a contagious viral infection, which causes respiratory illnesses. Commonly referred to as flu, it can attack the throat, lungs, and nose, by spreading through the upper or lower respiratory tract.
Flu mostly appears during the spring and winter seasons, and most of the time, it gets resolved on its own. But sometimes, it causes complications and can turn out to be deadly. So you should know what causes the flu and the ways to treat and prevent it .