Not the needle part, because whatever. But like…why does my arm feel like I got smacked with a baseball bat for a day after I get a vaccine?
In: Biology
The key to making a vaccine is you want to trigger the immune system to respond enough to make memory cells of the virus you are presenting it with.
You don’t want to make the person sick so you don’t use the real virus, but either a weakened version of it or just parts of it. If you weaken it too much or don’t use enough small parts, you won’t trigger enough of a response. If you don’t weaken it enough the person gets sick.
So you’re introducing just the right amount of foreign particles for your body to think “somethings wrong here, I must do something about it”. And the response is an inflammatory reaction, which comes with swelling, pain, heat and redness (inside the muscle you were injected with so you may not feel/see it on the surface).
All this makes your muscle ache when you move your arm until your body efficiently takes care of the problem
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