With any shot that goes into the muscle, the more you use the arm, the less it will hurt. People always say how much vitamin B12 shots hurt and this is why- it goes into the muscle. Flu shots, tetanus shots, into muscle. That's why they do it high on the arm- to ensure they get it into the Deltoid. Once someone told me this factoid about using the arm, I made sure I moved it around a lot and it really did make it better.
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