It just so happens that North America's "flu season" coincides pretty closely with our "common cold" season. Understandably, a lot of people have a tough time realizing which is which. Some people even think that their flu shot gives them a runny nose, but they are actually just going through a common cold around the same time they get their flu shot. If you're really worried about possibly having the flu, look for a few telltale signs we mention here. We hope you all stay healthy this winter and protect yourselves with the flu vaccine!