Flu Symptoms 2024. The symptoms of flu caused by h1n1, commonly called the swine flu, are similar to those of other flu viruses. Scientists say this is a sign that the virus is widespread in animals and inching closer to touching the average american’s daily life.

Flu can cause mild to severe illness, and at times can lead to death. Symptoms of influenza include acute onset of fever, cough, sore throat, body aches and fatigue.