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A member asked:
Is it normal for arms to swell and harden at the injection site after allergy shots?
A doctor has provided 1 answer
It's pretty common: it's an immune reaction. Personally, I kind of believe in the 19th century idea that a vaccine that makes more of a 'take' (the signs you mention) produces a better immune reaction. Vaccines vary between the type (live is stronger) and between people on how much inflammation they produce.
Answered 9/1/2018
2.9k views
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