Is It Stomach Flu or Influenza?

Sometimes people mistake symptoms of stomach flu, or gastroenteritis, for the viral infection we commonly call "flu." But the "stomach flu" is not the flu. It is a gastrointestinal illness caused by a number of factors including bacteria, viruses, and parasites. The flu, which causes fever, congestion, muscle aches, and fatigue is caused by viruses only.

For more information about differences, causes, symptoms, and treatments to http://www.webmd.com/cold-and-flu/flu-guide/stomach-flu-not-influenza.