10 Side Effects of Flu Shots
Flu Shots Side Effect #8: Swelling
The area immediately around the injection site is likely to become a little swollen and sore. This is perfectly normal and is not something to be concerned about. If swelling does occur anywhere else in the body after having received the shot, though, then you should certainly take notice.
Excessive swelling is an indication that you are having an allergic reaction to the flu shot and that you should seek emergency medical help. Allergic reactions from flu shots can lead to anaphylactic shock and they do have the potential to be fatal.
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