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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.
Any side effects you may have from the flu shot are typically mild. However, in rare cases, they can be severe. Before you get your flu shot, you may want to know what you might expect. Read on to learn about common and rare side effects of the flu shot as well as how to reduce these effects.