Shortly after the launch of the vaccines against covid-, stories began to emerge of women experiencing changes in their menstrual cycles after receiving immunization.
For a long time, this it did not attract much media attention, and many medical experts continued to assure the public that coronavirus vaccines did not cause these side effects. Such stories remained confined to conversations, internet forums and social networks.
Some women began to show that after the two doses of the vaccine, their menstrual cycles began to be different, such as heavy bleeding and more pain than usual.
Vaccines can affect menstruation
Now, a first-of-its-kind, female-led, peer-reviewed study confirms the experiences of some women: vaccines against the coronavirus can affect menstrual periods.
With a data set of almost 4,000 women, both vaccinated and unvaccinated, and with the use of a menstrual cycle tracking app, the researchers found a clinically significant change in the cycles of the newly vaccinated women, with an average length of almost a day longer.
Generally, cycles They returned to normal in a month or two. However, some women wondered why this possible side effect was not reported before receiving the vaccine.