Increased menstrual bleeding linked to Covid-19 vaccinations in new study
In a study on normal periods after vaccination, the study found that approximately 42 percent of respondents experienced heavier bleeding than usual after receiving the vaccine. Published in Science Advances 15 July after peer review.
Most respondents, while amenorrhoeic, reported heavy bleeding after taking one of the vaccines, including 66 percent who did not take postmenopausal hormone therapy and 65.7 percent who used one or more treatments.
The study began in April 2021 and the data from it was downloaded on June 29, 2021.
More than 128,000 responses were received, but many were excluded for reasons such as being diagnosed with Covid-19, not completing the survey in its entirety, or not reporting 14 days after the last dose of the primary series.
Additionally, women aged 45 to 55 years were excluded to exclude women in perimenopause.
“We did our analysis on regular menstruators and those who are not menstruating at the moment but have had periods in the past. “The latter group includes postmenopausal individuals and those on hormone therapies to suppress periods, for whom bleeding is particularly alarming,” said Kathryn Clancy, professor of anthropology at the University of Illinois at Urbana-Champaign in a statement.
She co-led the study with Catherine Lee, professor of anthropology at Tulane University.
About 39,000 responses were used.
‘We don’t want to talk about it publicly’
The researchers noted that as early as 2021, women began sharing incidents of unexpected bleeding after receiving the Covid-19 vaccine, but doctors who responded quickly dismissed the practices.
The study’s limitations include that women self-reported in the survey, but Clancy and others involved say the trends found in the results should help spur more research and discussion on the issue.
“Menstruation is a normal process in response to all kinds of immune and energetic stressors, and people notice changes in their bleeding patterns, but we don’t want to talk about it publicly,” Lee said in a statement.
Most respondents received the Pfizer or Moderna vaccine, while others received other vaccines such as AstraZeneca, Novavax, and Johnson & Johnson.
US Centers for Disease Control and Prevention He says. that they may experience “small, temporary changes” in their periods after the Covid-19 vaccine; American study in January Completed vaccinations with a change in cycle length and Research from Norway It was published in the same month that it showed a “significant increase” in menstrual irregularities after vaccination, especially after the second dose.
The U.S. researchers said the vaccinated group recovered in six cycles compared to the unvaccinated comparison group, but the Norwegian researchers said it was unclear how long the failures lasted.
In another follow-up study, about 300 women will participate. Published in MayReported menstrual irregularities.
The European Medicines Agency began investigating reports earlier this year of COVID-19 vaccines being linked to menstrual changes. The agency He came to the conclusion The Pfizer and Moderna vaccines, developed with messenger RNA technology, do not cause amenorrhea. The committee is still investigating possible links to hard times.