Covid-19: Vaccines may cause menstrual problems, study shows

Do Anti-Covid Vaccines Cause Menstrual Cycle Disruption? Yes, according to the results of a study released Wednesday by French health authorities, which suggest that the risk of menstrual disorders is slightly increased during the three months after the administration of the anti-Covid messenger RNA vaccine, while such a link still exists. Discussion in the scientific community.

The study “shows a 20% increase in the risk of heavy menstrual bleeding requiring hospital treatment within 1 to 3 months” after receiving the Pfizer or Moderna vaccine for the first time, Epi-Fhare summarizes in a press release from the institute, which brings. Together with the Medicines Authority (ANSM) and Social Security.

Heavy menstrual bleeding

Since the start of the anti-Covid vaccination campaign almost two and a half years ago, many women have reported disruptions in their menstrual cycles. Based on these statements, the European Medicines Agency (EMA) significantly included the presence of heavy menstrual bleeding as a possible side effect of messenger RNA vaccines, which are Pfizer/Biotech and Moderna.

However, studies on this topic remain conflicting and AP-Fare provides arguments in favor of the existence of such a link. Researchers identified the vaccination status of thousands of women hospitalized for heavy menstrual bleeding in 2021 and 2022. They compared their condition with a control group of women who were not treated for this reason.

Finally, they conclude that the risk of such menstrual irregularities is slightly higher when a woman receives the Moderna or Pfizer vaccine for the first time, each given in two consecutive doses. The risk lasts for three months and then, even after a subsequent booster dose, disappears. These results contrast with a larger study conducted in Sweden and published in Spring 2023 in the BMJ. This led to the conclusion that there is no solid evidence of a link between Covid vaccination and menstrual disorders.

Asked about these different findings, the AP-Ferre researchers pointed to a difference in methodology. They note in particular that the Swedish study considered a period of risk that began barely more than a week after the vaccination of the patients. This type of choice “can lead to a potential risk increase after a while,” explained epidemiologist Rosemary Drey-Spira, who oversaw the French study, later choosing to wait a month after the first dose of the vaccine.