The European Union’s health agency on Feb. 11 said is it investigating reports of certain COVID-19 vaccines being linked to menstrual cycle changes.
The safety committee of the European Medicines Agency (EMA) has launched “an in-depth evaluation of all available data, including reports from spontaneous reporting systems, clinical trials and the published literature.”
Several recent studies have found women who got vaccinated experienced changes in their menstrual cycles.
One, backed by the U.S. National Institutes of Health and reliant on women reporting their cycles, concluded vaccines were associated with an average change of under one day.
The EMA’s safety committee, or the Pharmacovigilance Risk Assessment Committee, didn’t cite specific reports of studies.
The panel previously analyzed reports of menstrual disorders following vaccination with the Pfizer or Moderna COVID-19 vaccines and concluded at the time that the evidence did not support a causal link between them.
But in light of “spontaneous reports of menstrual disorders with both vaccines and of findings from the literature,” the panel decided to take a fresh look at cycle changes and heavy periods following vaccination, it said in a statement.