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Mild Flu Shot Reactions. Mild Flu shot reactions include soreness, redness or swelling where the shot was given, hoarseness; sore, red or itchy eyes; cough, fever, and aches. A reaction to Flu vaccine continue they usually begin soon after the shot and last 1-2 days. Severe Flu Shot Reactions. Severe Flu shot reactions include allergic reactions. CDC says however that a life-threatening reaction to Flu vaccine is very rare. If Flu shot reactions occur, it is usually within a few minutes to a few hours after the vaccine.
Some people have significant allergic and other reactions to the flu shot. Photo Credit syringe with an ampoule. Flu shots contain deactivated, or killed, flu viruses. For the 2010-2011 flu season, the U.S. Centers for Disease Control and Prevention, or CDC, recommends that everyone over the age of 6 months be vaccinated against the flu.