Cold and Flu

What causes pain in my arm after a flu shot?

A Answers (1)

  • A , Pharmacy, answered
    Most flu shots are injected into the muscle, so you may have some pain in your arm after receiving a flu shot. The shot contains an inactivated, or killed, flu virus that prompts your body to create antibodies. Sometimes that reaction leads to swelling for a day or two at the injection site.
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