Your body has built-in defenses that 1) stop most things from getting in, and 2) set up "alerts" when things do get through so your immune system starts preparing to whoop ass the moment security is breached. Injecting a virus + the rest of what makes up a vaccine directly through the skin and into the bloodstream bypasses all that and throws the whole system out of whack.
That's all very well, but the whole point of the vaccine is to prepare the whoop-ass before the real virus comes along. That way, when one does encounter a pathogen that has breached your various layers of innate immunity, the response is immediate. The adaptive immune response, i.e. the one that will eventually end up responding, is famously slow, and it can take 14 days before full effectiveness is reached, which is generally far too late for actual protection against the current infection before symptoms start. 14 days is a long time and easily enough time for complications such as intercurrent infections to develop. Therefore, you prepare the defences.
Injecting a virus + the rest of what makes up a vaccine directly through the skin and into the bloodstream bypasses all that and throws the whole system out of whack. Why do you think people have such averse (and sometimes violent) reactions to them?
The mode of delivery of the vaccine (which, incidentally, does not have to be via intramuscular injection, it can be by intranasal spray) has no ultimate effect on the reaction.
Yes, it is possible for where the needle to go in to swell, become sore, hot, red, etc. This is normal inflammation.
Yes, it is possible for people to suffer low-grade pyrexia, malaise, etc. This is part of the normal immune response to the vaccine, as the begins. This is fairly common, but not the norm.
Yes, it is possible to suffer severe allergic reactions. This is rather rare, and is mostly associated with the egg proteins in the vaccine (as vaccines are generally made in eggs).
I simply encourage folks to educate themselves rather than just blindly listen to whatever the news or even your doctor (who, well-meaning though they may be, have been educated by and often paid off by drug companies) says.
So even though I'm well meaning, I, and any other person who has ever undertaken some sort of actual professional healthcare education (or even a science degree), is not to be trusted because we apparently are all paid off by the drug companies, and our education is all completely nonsense?
Well I look forwards to opening my bank account to find a sum of money large enough to completely eradicate all my morals, and to blindly recommend what the drug companies tell me to recommend. Hopefully it should also cover the costs of my student debt, because I apparently paid a lot of money towards a completely useless degree.
Much better to follow the enlightened individual on the internet who has seen the truth behind all medicine, and that is complete corruption, and brainwashing by the drug companies, so that we can say that we only meant well.
but I've seen and experienced enough to not take any medical treatment without careful consideration. And I dislike unnecessary procedures such as this one is for most people
I too have seen a fair few unnecessary procedures performed on patients. But often they're unnecessary because the patient for one reason or another, didn't follow the advice we gave (because that advice was completely wrong and bought for by the drug companies). Yes, screw the cheap prophylactic intervention. I'd much rather have the expensive and invasive treatments, because that's the right way to go about getting ill.