PHILADELPHIA (CBS) -  A million-and-a-half Americans already received their flu shots but many are wondering whether there are any side effects they should worry about.

To say that you won’t have any side effects is just foolish. A certain number of people, anywhere from 10 to 25 percent, will get some fatigue, malaise, some achiness, or a little bump or pain in the arm. This usually only lasts about a day or two and it’s nothing much more than that.

When you take that against the long-term effects of fighting the flu and having to deal with it and the risks associated with it, there is a clear advantage to getting the shot and preventing problems down the road.

Reported by: Dr. Brian McDonough, KYW Newsradio