I've had three shots, and I've noticed I've been getting colds a lot more often than before. My friends say it's just a coincidence, but it seems to me like right after vaccination my immune system is acting weird somehow. Could that be a side effect, or am I just imagining it?
I'd rethink the logic here: if the vaccine actually weakened your immune system, people would get sick more severely and for longer after vaccination, not just more frequently. In reality, it's the opposite - the vaccine teaches your body to recognize the virus, so your immune system becomes more active. And frequent mild colds after vaccination are usually just a sign that your immune system is in top form and reacts faster to any infection.
There's also a purely psychological element to this: we tend to remember events that coincide with something significant. You get vaccinated, then get sick for a week - and the connection seems obvious. But people actually catch colds all the time; they just usually don't pay attention to it. After vaccination, you're more aware, so you notice everything more acutely. Try to recall how often you got sick during specific months in the two years before your shots - chances are it'll be about the same.
Honestly, frequent colds could be from stress, sleep deprivation, poor hygiene, getting chilled, or just because you're spending more time in enclosed spaces with people. These are all real reasons and way more likely than a vaccine side effect. If you're still worried, talk to your doctor - they can look at the bigger picture.
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