Side effects after vaccination: who gets them and why

Side effects such as headache, fatigue and fever are caused in many people by the coronavirus vaccine.

As the publication writes, according to scientists, the symptoms are considered very common and are a normal reaction of the body to the vaccine.

Peter Marks, head of vaccines at the US Food and Drug Administration, said that “there is no need to schedule any strenuous physical activity the day after vaccination.” After the first dose, he himself felt tired.

But what is the cause of the side effects in the body? The immune system has two subsystems. The first begins to work as soon as the body detects a “foreign invader”. White blood cells build up in place and cause inflammation, which is believed to be the cause of chills, pain, fatigue, and other side effects. The system is activated immediately, especially in younger people, who report side effects more often than older people.

In addition, some vaccines cause more side effects than others. Of course, every organism reacts differently. If someone has received the vaccine and does not feel any symptoms one or two days after being vaccinated, this does not mean that the vaccine is not working. Already with the introduction of the dose, the activation of the second immune subsystem began, which provides real protection against coronavirus by producing antibodies.

Another reported side effect is temporary swelling of the lymph nodes, for example, in the armpit.

Women are advised to schedule a routine mammogram before vaccination to avoid misdiagnosis of cancer. Not all side effects are common. However, after hundreds of millions of doses have been administered worldwide and intensively monitored by scientists, several serious cases have been reported.

A small percentage of people given the AstraZeneca and Johnson & Johnson vaccines have reported blood clots. Some countries have chosen to only administer these vaccines to older people.

Regulators insist vaccine benefits outweigh risks

Cases of severe allergic reactions have been reported from time to time. Therefore, after the introduction of any vaccine, each citizen must remain in the vaccination center for about 15 minutes in order to stop (start treatment) any body reaction that may occur.

With the thrombosis problem found with the AstraZeneca and Johnson & Johnson vaccines, authorities are trying to determine if mRNA vaccines (Pfizer, Moderna) are associated with rare cases of myocarditis or pericarditis.

According to US health officials, it has not yet been possible to answer whether such a connection really exists. As noted, there have been a small number of reports of this side effect that has arisen in young people, males.

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