After getting a dose of Covid-19 vaccine, women had an average menstrual cycle length of about one day longer than usual, according to a new study. But the change is not clinically significant, and experts say it shouldn't cause worry.
After getting a dose of Covid-19 vaccine, women had an average menstrual cycle length of about one day longer than usual, according to a study published Thursday.
The findings validate some claims from women across social media that the Covid-19 vaccine affected their menstrual cycle. But the change is not clinically significant, and experts say it shouldn't cause worry. "The bottom line is, we really think these findings are reassuring for health and reproductive health," and they dovetail with similarly reassuring data on the safety of Covid-19 vaccines regarding pregnancy and fertility, Dr.
The study researchers analyzed data from about 4,000 women who used the Natural Cycles app to track menstruation, including about 2,400 who became vaccinated over the course of the study and about 1,600 who remained unvaccinated. This study does not specifically address fertility or other possible changes in menstrual cycles, such as symptoms or unscheduled bleeding.
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