Can the Covid-19 vaccine have side effects in women during their period?

“To date”, the Medicines Agency (ANSM) indicated that it could not “establish a link” between the two.

Yet in recent weeks, "261 cases of menstrual disorders, including 30 serious (most often associated with other adverse effects such as flu-like syndrome), have been analyzed in women with a median age of 36.5 years" after an injection of the Pfizer BioNTech vaccine.

For the Moderna vaccine, “49 cases of menstrual disorders, including 6 serious”, were analyzed “in women with a median age of 38 years”, adds the National Drug Safety Agency in its report on adverse reactions related to Covid-19 vaccines.

The ANSM had classified menstrual disorders last week as a "potential signal" (heavier periods, shifted from the usual cycle, post-menopause bleeding, etc.) after vaccination with Pfizer or Moderna, and reported to the Agency. European Medicines Agency (EMA).

European Medicines Agency evokes "stress and fatigue"

"The evolution is spontaneously favorable in a few days for the vast majority of cases", explains the ANSM adding that the causes of these disorders can be "multiple". "If these menstrual disorders persist, we invite people who have been vaccinated to see their doctor," she adds.

For its part, the Pharmacovigilance Risk Assessment Committee (PRAC) of the European Medicines Agency also indicated on Friday that "no cause and effect link had been established at this stage between vaccines against Covid-19 and menstrual disorders ”.

These disorders "are very common and can occur unrelated to a medical problem", underlines the PRAC, citing "stress and fatigue" among the possible causes.

The European medicines policeman adds that he has requested "additional data" from laboratories and "continues to monitor the subject" by analyzing the reports of adverse reactions and the available scientific literature.

"Any immune activity can cause slight disturbance"

Some specialists suggest the hypothesis of a reaction of immune cells present in the uterine lining as a possible mechanism of action.

"Any immune activity can cause a slight or transient disturbance of the menstrual cycle without consequences in the medium and long term", said Thursday on France Inter the infectious disease specialist Karine Lacombe.

The ANSM also explains that it has set up "specific monitoring of the adverse effects reported with all vaccines in pregnant women", which has shown "no signal" of pharmacovigilance in this population.

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