Bianchi hopes that the additional research can look at a more diverse population than those that use the app, and also start to nail down other reported side-effects, including heavy periods and breakthrough bleeding. Last summer, the agency funded five studies including Edelman's work, and the results of the other researchers should provide more data. "The risk of COVID-19 disease in pregnant women is incredibly serious," said Edelman, who has watched pregnant women end up in intensive care because they're not vaccinated.īianchi says that the NIH should have more data on how vaccines alter menstruation in the near future. Shots - Health News Vaccinating During Pregnancy Has Become Even More Urgent As ICU Beds Fill Up But whatever's happening seems to be short-lived. Given that relationship, it's entirely possible that triggering the immune system through vaccination might change a person's cycles. Edelman says the immune system and the reproductive system are linked, and some signaling immune cells also can affect the body's natural clock. Researchers still aren't exactly sure why the changes occur. The immune and reproductive systems are linked "I think the beauty of the study is that it does affirm what individuals were reporting," she says. Nevertheless, she adds, it does prove that the vaccines are affecting menstruation independently of other possible factors such as pandemic stress. "It's really nothing to get alarmed about," Bianchi says. In other words, people who were vaccinated experienced - on average - a slightly longer menstrual cycle around the time of their first and second doses.
"We see a less-than-one-day change in their menstrual cycle length with vaccination," Edelman says.
Looking at data from 3,959 individuals, they were able to see a small shift in the time between bleeding. Diana Bianchi, director of the Eunice Kennedy Shriver National Institute of Child Health and Human Development, which funded the work.Įdelman's team took data from a popular app known as " Natural Cycles," which people can use to track their menstrual cycles. "There was a need to be able to counsel women on what to expect," says Dr.
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