Nearly 50% of the females who were inoculated against this virus reported irregular menstrual cycles.
A new study revealed that almost half the recipients of Covid-19 vaccines experience abnormal menstruation.
Researchers from Washington University School of Medicine (UIL) published the results of the survey in Science Advances journal. Nearly 40,000 women aged 18 to 80 across the globe were invited to complete an online survey about their menstrual cycle. Scientists then analyzed and standardized the answers.
Researchers say that the research was initiated after anecdotal reports dating back to early 2021, which described unusual menstrual bleeding among women and transgender males who received the Covid-19 vaccine.
According to the study’s findings, 42% of respondents who had previously had regular cycles reported heavier bleeding after receiving the shot. 44% observed no improvement, and 14% saw lighter bleeding.
Not only did the participants experience unusual bleeding, but so did transgender and postmenopausal females, as well as those who were on long-acting contraceptives.
The respondents had received the Pfizer-BioNTech, Moderna, Johnson & Johnson vaccines or another that had been approved outside the United States. They also claimed that none of the participants had ever contracted Covid-19 after being immunized.
The study – the largest of the kind to date – appears to corroborate the findings of previous, smaller surveys.
The researchers, however, point out that the observed changes to women’s cycles are only temporary and should in no way be used to call into question the overall efficacy and safety of Covid 19 vaccines.
“I think it’s important that people know this can happen, so they’re not scared, they’re not shocked and they’re not caught without supplies,” Katharine Lee, a biological anthropologist at the Washington University School of Medicine in St. Louis, and one of the study’s authors, explained.
The researchers concluded that women should not delay vaccination for more than a couple of weeks because the consequences could be much worse than any menstrual problems.
The authors said they hope more transparency around Covid 19 vaccines’ side effects could help reduce people’s hesitancy and fears.