Research Sheds Light on Side Effects of COVID-19 Vaccination

By Dr Frank Yap, M.D. -

Shortly following their COVID-19 vaccinations, individuals in Denmark reported mild side effects like general discomfort, elevated body temperature, and tiredness. Severe adverse reactions like facial paralysis and allergic responses are rare. Additionally, 30% of menstruating women reported alterations in their menstrual cycles.

Aarhus University has recently published two studies examining the side effects of COVID-19 vaccines. Both studies are based on the Danish BiCoVac cohort, which makes it possible to carry out studies based on a large group of the Danish population. One of the studies examined the acute side effects of Covid-19 vaccination.

The most frequently reported side effects after the first small prick on the shoulder are redness and pain at the injection site, which 20% of people experience. After the second and third jabs, fatigue is the most reported side effect – reported by 22% and 14% of people, respectively.

The study has been published in the journal Vaccine. The study found that common side effects such as malaise, fever, and fatigue are among the most frequently reported in Denmark after Covid-19 vaccination. More serious side effects such as facial paralysis and allergic reactions are not as common.



“Women, people between the ages of 25-35, and people who had Covid-19 prior to being vaccinated reported experiencing side effects more frequently than men, the elderly, and people who had not previously had Covid-19,” says Kristoffer Torp Hansen, first author of the study and research assistant at the Department of Public Health.

The results also show that the acutely occurring side effects differ depending on which vaccine is administered.

People vaccinated with the AstraZeneca vaccine reported more side effects after the first dose than people vaccinated with the other vaccines.

People who received the Moderna vaccine reported more side effects after the second and third doses compared to people who received the vaccine from Pfizer-BioNTech.

Several factors play a role in the reporting of menstrual changes

The second study showed that 30% of menstruating women reported changes in their menstrual cycle after being vaccinated against Covid-19.

The researchers examined which factors could potentially play a role in those changes and discovered that commonly known causes of menstrual changes, such as stress, age, and smoking, had a correlation with the reported cycle changes after Covid-19 vaccination.

“We also found that women who had been concerned about the Covid-19 vaccine, who had had a severe Covid-19 infection or who reported experiencing several reactions to the vaccine were more likely to report menstrual changes after vaccination,” says Christina Bisgaard Jensen, PhD student at the Department of Public Health. She is the first author of the study, which has just been published in the scientific journal Human Reproduction.

“Changes in the menstrual cycle are not uncommon, and we cannot rule out that, for some people, the reported menstrual changes occurred randomly in temporal relation to the vaccination,” says Christina Bisgaard Jensen, who further explains that the study cannot be used to identify a direct correlation between Covid1-9 vaccination and the reported menstrual changes.

“Further studies are needed to establish causal relationships and the clinical significance of self-reported menstrual changes,” she says.

References: 

“Immediate adverse reactions following COVID-19 vaccination among 16–65-year-old Danish citizens” by K. Torp Hansen, F. Kusk Povlsen, B. Hammer Bech, S. Nygaard Hansen, C. Ulrikka Rask, P. Fink, T. Jørgensen, H. Nielsen, T. Meinertz Dantoft, S. Marie Thysen and D. Rytter, 23 June 2023, Vaccine.
DOI: 10.1016/j.vaccine.2023.06.069

“Prevalence of and risk factors for self-reported menstrual changes following COVID-19 vaccination: a Danish cohort study” by C Bisgaard Jensen, B Hammer Bech, S Nygaard Hansen, C Ulrikka Rask, P Fink, H Nielsen, T Meinertz Dantoft, S Marie Thysen and D Rytter, 12 July 2023, Human Reproduction.
DOI: 10.1093/humrep/dead144

Read more articles related to vaccine: Vaccine series.

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