To do the study, the authors used a survey asking people about their experiences after receiving the covid vaccine.
The largest study conducted to date with more than 35,000 participants – women and people with gender diversity – has confirmed that 42% of women experienced an increase in menstrual bleeding in the two weeks following vaccination against covid- 19.
In addition, the study describes for the first time the appearance of spontaneous bleeding in a high number of people who did not have menstruation -because they had menopause or because they were following hormonal contraceptive treatment or for gender change-, after receiving the vaccine against SARS-CoV-2.
The conclusions of this study, published this Friday in the journal Science Advances, confirm a side effect that had been reported by women and ignored by science and reveal that this effect of the vaccine has affected “a significant number of people.”
However, the study data show that these alterations are temporary and are associated with certain triggering factors such as age, suffering from systemic secondary effects associated with the vaccine (fever or fatigue), or history of pregnancies and childbirth, among others. .
“Menstruating and previously menstruating people began to report experiencing unexpected bleeding after being given the vaccine in early 2021,” say US researchers and study leaders Katharine Lee of Tulane University and Kathryn Clancy of the University of Illinois Urbana-Champaign.
In vaccine trials, menstrual cycles or bleeding are not usually asked about, so this side effect is often ignored or ruled out of studies, despite the fact that some vaccines, such as those for typhoid fever, hepatitis B and HPV, can alter menstruation.
To do the study, the authors used a survey asking people about their experiences after receiving the covid vaccine.
The authors only included data from people who had not had covid-19 (because the disease can cause menstrual changes) and excluded data from people between 45 and 55 years of age to avoid confounding the results with menopause or menopause. the previous changes.
Thus, the study focused on people with menstruation, menopausal women and people with hormonal therapies that suppress the cycle.
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