That’s why with most vaccines the next day or days people feel like shit
I have been warned about this for every vaccine I remember taking… other than the occasional sore spot where the injection went, I have never felt any other side effects.
This is anecdotal of course, but I am pretty sure the instances of these mild side effects is less than 10%
Usually I don’t really feel any vaccines, maybe a bit less energy the day after.
But one of the covid vaccines (I think the one for omicron) hit me like a ton of bricks, I was passed out on my bed for a good 24 hours and felt like shit for a couple of days. Heard similar from other people. But with another covid shot I felt nothing where my girlfriend had the worst headache for a day.
So it depends as always. One day of being sick is so much better than getting some of the awful diseases I’ve been vaccinated against.