People who got the Covid-19 vaccine reported slightly longer menstrual cycles, but the change was temporary, according to a new study.
“Compared with the unvaccinated group, vaccinated individuals had an adjusted increase in menstrual cycle length of less than one day with both first and second vaccine doses,” wrote the study authors, from universities in Oregon, Massachusetts, London and Edinburgh. “Individuals who received two doses of a covid-19 vaccine in a single cycle had an adjusted increase in cycle length of 3.70 days compared with the unvaccinated.” The vaccinated cohort had a change in cycle length of around 0.
The authors looked at nearly 20,000 people, representing over 250,000 cycles, who recorded their data using the app Natural Cycles between October 1, 2020 and November 7, 2021. For the vaccinated cohort, they looked at three prevaccine cycles and at least the first Covid-19 vaccine dose cycle. For the unvaccinated, they included four to six cycles from a similar time period. The participants came from a number of countries, but mostly from Europe and the US and Canada.
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