A new study finds that receiving a COVID-19 vaccine causes a slight increase in the length of one menstrual cycle, reinforcing the findings of a previous paper that looked at data from U.S. participants.
“We found a small change in cycle length of about a day in individuals that got one vaccine in a cycle as compared to an unvaccinated group. And then for individuals that received two vaccines in a cycle — if you recall the initial vaccines were supposed to get about a month apart — those individuals experienced a greater cycle change so almost up to four days,” Dr.
For this study, Edelman and her colleagues looked at data from 20,000 people using an app, Natural Cycles, to track their periods. Some people received the vaccine while others, the control group, did not. Researchers looked at three cycles before the vaccine and then cycles during vaccination and after to understand the participants’ schedules.
“It’s causing a slight disturbance,” Dr. Adi Katz, director of gynecology at Lennox Hill Hospital in New York City, who was not involved in the research, told TODAY. “The COVID-19 vaccine is similar to the COVID infection in that it causes an immune response in the body and a lot of the process of menstruation is also immune mediated.”
Katz adds that people worried that the COVID-19 vaccine impacted fertility and she stressed that this is not true.
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