If you experienced menstrual changes, there might be an answer.
The data on changes in menstrual cycles came from nearly 4,000 women using the
, about 60% of whom had received the COVID-19 vaccine. That data has one very important drawback, however. As thepoints out, the set of women using the Natural Cycles app isn’t nationally representative—these users tend to be white, educated, thinner than the average American woman, and are not using hormonal contraception, making it difficult to draw generalizable conclusions.
Alison Edelman, M.D., a professor of obstetrics and gynecology at Oregon Health & Science University and the lead author of the study, also noted that there’s lots of room for individual variation in the data. For example, a large factor influencing the findings was a group of 380 women who experienced a two-day delay in the start of their period, she told the—experienced cycles eight days longer than normal.
The study is a step in the direction of understanding how the COVID-19 vaccine—and vaccines in general—impact periods. “It validates that there is something real here,” Hugh Taylor, M.D., chair of the department of obstetrics, gynecology, and reproductive sciences at Yale School of Medicine, who was not involved in the study, told theAdding, “I want to make sure we dissuade people from those untrue myths out there about fertility effects.
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