COVID-19: Why do some people have side effects after vaccination?

COVID-19: Why do some people have side effects after vaccination

As millions of people across the world are getting vaccinated every day, more and more questions about the side effects after vaccination continue to plague people's minds.

Temporary side effects including headache, fatigue and fever are signs the immune system is revving up – a normal response to vaccines. And they are common.

“The day after getting these vaccines, I wouldn’t plan anything that was strenuous physical activity,” said Dr. Peter Marks, the U.S. Food and Drug Administration’s vaccine chief, who experienced fatigue after his first dose.

Here is what’s happening: The immune system has two main arms, and the first kicks in as soon as the body detects a foreign intruder. White blood cells swarm to the site, prompting inflammation that’s responsible for chills, soreness, fatigue and other side effects.

This rapid-response step of your immune system tends to wane with age, one reason younger people report side effects more often than older adults. Also, some vaccines simply elicit more reactions than others.

That said, everyone reacts differently. If you did not feel anything a day or two after either dose, that does not mean the vaccine is not working.

Behind the scenes, the shots also set in motion the second part of your immune system, which will provide the real protection from the virus by producing antibodies.

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As millions of people across the world are getting vaccinated every day, more and more questions about the side effects after vaccination continue to plague people's minds.

“We know that children play a role in transmitting the virus. “We know the rest of the population is not fully vaccinated.