Lifehacker – and How to Deal With Them – “…Before we go any further, we should note that experiencing side effects isn’t specific to the COVID vaccine: They can occur after a flu shot or other vaccination, and are a sign that your body is responding to the vaccine. Specifically, in the case of the COVID vaccine, that “your immune system is instructing your body to react in certain ways: it increases blood flow so more immune cells can circulate, and it raises your body temperature in order to kill the virus,” the World Health Organization (WHO) explains. So, when someone experiences mild-to-moderate side effects following the COVID vaccine, it’s not uncommon for their doctors or family members to reassure them that not only is this normal, it’s also a good thing. It doesn’t mean that the vaccine is dangerous—it means that it’s doing its job…”