Swine flu symptoms and signs: Swine flu is an influenza A H1N1 virus. Symptoms of swine flu in humans are similar to that of the regular flu. The big difference is that the current swine influenza A (H1N1) virus is new and most of us don't have any immunity against it. That is why it so simply became a pandemic virus because it could easily spread from person to person. Therefore, it is important to know the symptoms of the disease so that you can identify the symptoms in you and your loved ones at an early stage.