COVID-19 vaccines do not cause major menstrual issues: Study

Getting vaccinated against COVID-19 does not make women more likely to seek medical attention for menstrual problems.

Getting vaccinated against COVID-19 does not make women more likely to seek medical attention for menstrual problems, the largest study conducted on the subject said on Thursday (May 4).

Since COVID-19 vaccination campaigns began nearly two and a half years ago, some women have reported changes in their menstrual cycle after getting the mRNA shots from Pfizer-BioNTech and Moderna.

This led to the European Union's drug watchdog recommending that heavy periods be listed as a possible side effect of the vaccines.

It has also been greatly exaggerated by anti-vaccine campaigners seeking to spread misinformation online about the supposed dangers of getting inoculated, according to experts.

The new study looked at patient data from Sweden's health registry which included nearly three million women, around 40 per cent of the country's female population.

Rickard Ljung, a professor at the Swedish Medical Products Agency and lead author of the new study, said that it was "by far" the largest carried out on the issue.