People who have the flu often feel some or all of these signs and symptoms that usually start suddenly, not gradually:
*It’s important to note that not everyone with flu will have a fever.
Most experts believe that flu viruses spread mainly by tiny droplets made when people with flu cough, sneeze or talk. These droplets can land in the mouths or noses of people who are nearby. Less often, a person might also get flu by touching a surface or object that has flu virus on it and then touching their own mouth, nose, or possibly their eyes