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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.
1 Severe swelling, pain, or bleeding in the arm where the shot was given. 2  A very high fever.  Signs of allergic reaction within a few minutes to a few hours of vaccine. These may include: hives, swelling of the face or throat, difficulty breathing, rapid heartbeat, and dizziness.