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What are the side effects of the flu shot?

April 26, 2017flu shot

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What are the side effects of the flu shot?

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Mild arm soreness and redness or swelling at the injection site are the most common side effects and may last one to two days. Other potential side effects, such as allergic reactions, are rare. There may be a one in a million risk of Guillain-Barré syndrome, a rare paralytic illness.