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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.
Many people worry about side effects from the flu shot, but serious complications are rare. Some people believe that they can actually get the flu from receiving the shot, but this is not the case. For the majority of people, the risks of developing the flu are far greater than any risks associated with the vaccine.hese symptoms also go away after about 1 to 2 days. Because the flu shot contains inactivated, or killed, virus particles, there is no possibility of contracting the infection from the flu shot. Allergic reactions to the flu shot are very rare.