Mayo Clinic Minute – Why is your arm sore after a flu shot?

A flu shot can’t give you the flu, but it can, and often does, cause arm soreness.

Dr. Jesse Bracamonte, a Mayo Clinic family medicine physician, says it’s a common side effect of the flu shot and other vaccinations.

“You can have a little bit of swelling, a little bit of redness, definitely achiness. These are all common,” says Dr. Bracamonte. “Most of the time, it lasts about two or three days.”

He says, in most cases, those symptoms mean that the vaccine is working.
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