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
That’s the vaccine working.
The needle causes only very minor damage unless the person giving it to you REALLY screwed it up.
The vaccine tricks your immune system into thinking it’s fighting the sickness.
The main thing is the production of antibodies so you don’t get infected for real, but it also turns on a lot of the other things the body uses to fight a sickness.
Stuff like causing the place to swell and to hurt, like you got a bad wound there.
If it was a real wound, it would be the body telling you to not get the wound hurt worse, but your body can’t tell it’s not a real wound.
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