In a new study, 42% of about 16,000 survey respondents who had a regular menstrual cycle said they bled more heavily than usual after COVID19 vaccination.
Kathryn Clancy got her first dose of a COVID-19 vaccine in early 2021 and 10 days later found herself sitting uncomfortably in a work Zoom meeting during one of the heaviest periods she’d experienced. “I had what’s often called menstrual flooding,” says Clancy, a biological anthropologist at the University of Illinois, Urbana-Champaign.
Clarifying the issue is vital. “It’s important to know about,” says Victoria Male, a reproductive immunologist at Imperial College London. “Let’s say you got the vaccine and the next day you felt really dreadful the way some people do.” If you hadn’t been informed of the chance of fever, muscle aches, and other effects that quickly dissipate, “you would be really worried,” she said.
After Clancy’s initial tweet drew such a response, she and Lee set out to learn more, initially aiming for a 500-person survey of menstrual experiences after COVID-19 vaccination. When 500 signed up in the first hour after the survey was posted online, Clancy realized the project would balloon well beyond what she’d anticipated.
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