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COVID-19: Are there side effects from the booster?

Some people who have received the COVID-19 booster shot have complained of adverse reactions.

COVID-19 booster shot has left some feeling side effects

A new study suggests that the side effect reports have been “greatly exaggerated.”


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What are the side effects?

Hours after receiving the booster dose, some people reported mild side effects. Studies suggest that some of the most common complaints could actually be from a negative version of the placebo effect. Read about it here.

Clinical trail data from the Pfizer, Moderna, and the single-dose Johnson & Johnson boosters were collected. The most common side effects include:

  • injection site pain
  • fatigue
  • headaches
  • muscle pain

These side effects are mild and consistent with those of the initial vaccine course.

There are some new and different side effects though:

  • chills (reported from Pfizer booster)
  • mild joint pain (reported from Moderna booster)
  • nausea (reported from J&J booster)

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The side effects may be over reported

Research claims that up to two-thirds of the common side effects reported from the COVID-19 vaccine may not be a consequence of the shot.

Data from 12 clinical trails has been pooled together. Scientists found that the ‘nocebo effect’ could be responsible for more than half of the complaints.

The nocebo effect is the negative version of the placebo effect.

“The combined study found that the nocebo effect could account for around 76% of negative reactions to the first dose, and 52% of those reported after the second dose.”

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