Increased menstrual bleeding associated with COVID-19 vaccines in new study

Increased menstrual bleeding associated with COVID-19 vaccines in new study
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Increased menstrual bleeding has been linked to COVID-19 vaccines in a new study.

According to the study, about 42 percent of those asked in a survey on menstruation after vaccination with regular menstrual bleeding said that they bled more than usual after a vaccination. published in Science Advances after peer review on July 15.

A majority of respondents who did not have periods, meanwhile, reported breakthrough bleeding after receiving one of the vaccines, including 66 percent of postmenopausal women who did not receive hormone treatment and 65.7 percent of women who used one or more treatments.

The survey was launched in April 2021 and the data from it was downloaded on June 29, 2021.

Over 128,000 responses were received, but many were excluded for reasons such as being diagnosed with COVID-19, not completing the survey completely, or failing to report at least 14 days after their last dose of a primary series.

Also, women aged 45 to 55 were excluded to avoid including perimenopausal women.

“We focused our analysis on those who are menstruating regularly and those who are not currently menstruating but have had in the past. The latter group included people who were postmenopausal and people on hormone therapies that suppress menstruation, for whom bleeding is particularly surprising,” said Kathryn Clancy, professor of anthropology at the University of Illinois Urbana-Champaign, in a statement.

She led the research with Katharine Lee, an anthropology professor at Tulane University.

In the end, about 39,000 answers were used.

“We don’t tend to talk about it publicly”

The researchers said women began sharing cases of unexpected bleeding after receiving COVID-19 vaccines in early 2021, but doctors who responded were often quick to dismiss the experience.

Limitations of the study include that women self-reported on the survey, but Clancy and others involved said the trends revealed by the results can help spur further research and stimulate discussion on the topic.

“Menstruation is a regular process that responds to all kinds of immunological and energetic stressors, and people notice changes in their bleeding patterns, but we don’t tend to talk about it publicly,” Lee said in a statement.

Most respondents received a vaccine from Pfizer or Moderna, but others received the other vaccines, such as those from AstraZeneca, Novavax, and Johnson & Johnson.

The US Centers for Disease Control and Prevention says suggesting that women who are menstruating may experience “small, transient changes” in menstruation after the COVID-19 vaccination a US study from January who concluded that the vaccines were associated with a change in cycle length and Research from Norway published the same month noting “a significant increase” in menstrual irregularities after vaccination, particularly after a second dose.

US researchers said the vaccinated cohort they studied was back in line with an unvaccinated comparison group by six cycles, but the Norwegian researchers said it was unclear how long the irregularities lasted.

Nearly 300 women who participated in another observational study released in Mayreported menstrual irregularities.

The European Medicines Agency launched an investigation earlier this year into reports of the COVID-19 vaccines being linked to menstrual changes. The Agency closed Pfizer’s and Moderna’s vaccines, both based on messenger RNA technology, do not cause menstrual cessation. The committee is still investigating possible links to heavier periods.

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