Why does your muscle hurt when you get a flu vaccination?

Answer #1

It’s possible to have an allergy to the preservatives in the shot. It makes your arm sore.

Answer #2

because the injection goes into the muscle. It causes a bit of injury, which needs to heal. The tenderness can also be associated to the stuff that is in the shot.

Answer #3

Agreed, it goes into the muscle and damages it a bit, so it’ll be sore for a few days afterwords. (Also the fluid in there can burn your tissue as well)

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