Why do you sometimes feel sick after a vaccine?
The culprit is none other than your very own immune system!
Your immune system reacts to vaccines the same way it would to a real infection. Its goal? Fight and eliminate the “potential intruder” and build a defense. To do so, it will release all sorts of signals that will cause many of the symptoms you are experiencing after a vaccine, but also when you are battling an infection.
These side effects* are completely normal, and can vary greatly among individuals!
*Rare adverse side effects do happen, check out our sources doc for a link with signs and symptoms to be aware of 👇