It is very difficult to establish a link between anti-Covid vaccines and the occurrence of major menstrual disorders, concludes Thursday one of the largest studies to date published in the British Medical Journal (BMJ). This unprecedented work was based on the health data of some three million Swedish women, or 40% of the country’s female population.
Since the start of the anti-Covid vaccination campaigns, the subject has been the subject of many questions because many women have reported disturbances in their menstrual cycles. Based on these statements, the European Medicines Agency (EMA) notably ended up including the presence of heavy menstrual bleeding as a possible side effect of messenger RNA vaccines, those from Pfizer/BioNTech and Moderna. Nevertheless, these are disorders declared individually by the patients. However, the progress of the rules is very variable from one woman to another and the menstrual disturbances can come from a multitude of factors. According to the results of the BJM study, however, anti-Covid vaccines do not seem to be one of them.
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Indeed, the authors showed that, in women of menstruating age, there is no clear link between having been vaccinated – by Pfizer/BioNTech, Moderna or AstraZeneca – and having then consulted a health professional for a menstrual cycle disorder.
However, these results are based on the fact of having requested such a consultation and cannot therefore account for menstrual disorders that would not have given rise to contact with a caregiver. “What we’re showing is that if there are disorders, they don’t seem serious enough for women to see a doctor,” commented Rickard Ljung, one of the study’s lead authors.
Moreover, in postmenopausal women, the study establishes a slight association between vaccination and the fact of having consulted for bleeding. However, this association is “weak and non-uniform” and, in detail, does not necessarily fit with the hypothesis of a cause and effect link, say the researchers.
