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Update (July 18, 2022): New survey data published in Science Advances finds that among 40,000 people, increased menstrual flow or breakthrough bleeding after getting vaccinated against COVID-19 was widespread. The authors note that variations in menstrual flow are not uncommon or inherently harmful, but call for future vaccine studies to include these types of effects.
Editor’s note (April 27, 2022): Substack writer Sarah Burwick alleges in a detailed post that Risa Hoshino has made multiple untrue statements on social media, including in posts that solicited money from her followers. The Scientist has no reason to believe that Hoshino's quotes in this article were inaccurate.
As the number of people who have received the COVID-19 vaccines grows, so do the anecdotal stories about side effects. On social media, some women have claimed that after receiving the shot, their menstrual period has gotten heavier, lighter, or varied in ...
