Covid-19 Vaccines, according to researchers, are not entirely unlikely to affect periods. Even if this were the case, the disorder would be classified as a relatively innocuous side effect.

Hundreds of Scandinavian women have experienced menstrual problems after receiving the COVID-19 vaccine.

According to the Swedish Medical Products Agency, there have been as many as 400 cases, while Denmark has reported over 1,000 cases of menstrual irregularities linked to the vaccination.

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“These are menstrual abnormalities in connection with vaccination against COVID-19. It can be irregular menstruation, but it can also be about bleeding after menopause,” Ebba Hallberg, senior expert at the Swedish Medical Products Agency, told national broadcaster SVT.

Both her agency and the European Medicines Agency (EMA) are monitoring the situation, but there is no way of knowing whether it is a side effect or not because no link has been established.

“This is something we keep an eye on, but at present we can not comment on whether there is any connection with the vaccines or not. This is also followed at the EU level, but no support for a connection has been found there either,” says Ebba Hallberg.

She explained that current menstrual disorders can occur for a variety of reasons, and that they can also occur in the absence of vaccination.

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“That is what makes it so difficult to know, whether it is normal or not,” Ebba Hallberg said.

However, the vast majority of studies have been assessed as “non-serious suspected adverse reactions” and are not seen as a cause of concern.

“It has not led to any hospital stay or been life-threatening. In Sweden, most of the reports come from private individuals,” she summarised.

However, as reports of temporary changes in the menstrual cycle following vaccination continue to circulate around the world, the University of Illinois will investigate this phenomenon in a study.

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Vaccines that affect periods, according to University of Gothenburg researcher Ali Harandi, are not completely out of the question. Even if this is the case, SVT reported that it would be classified as a relatively harmless side effect that would pass.

Photo by FREDRIK SANDBERG/TT News Agency/AFP via Getty Images