Some people who have received a COVID-19 vaccine have reported a temporary change in their menstrual cycles, according to a new study.
Vaccinated people had an adjusted increase in menstrual cycle length of less than 1 day with both the first and second vaccine doses. The increase wasn’t associated with a change in the number of days of menses, or bleeding. The changes appeared to be similar regardless of the type of COVID-19 vaccine.
Researchers at universities in Oregon, Massachusetts, London, and Edinburgh looked at data for international users of Natural Cycles, a menstrual cycle tracking app, between October 2020 and November 2021. Overall, vaccinated people had a 0.71 day increase in their cycles after the first dose and a 0.56 day increase after the second dose. Those who received two doses in one cycle had an increase of 3.7 days, though there wasn’t an increase in the days of bleeding.
“A change in cycle length of less than eight days is considered within the normal range of variation,” the NIH said. “Although small menstrual changes may not be meaningful to health care professionals and researchers, perceived changes in a bodily function linked to fertility may be alarming to those experiencing it and could contribute to vaccine hesitancy.”
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