42% of women saw increased bleeding during their period after being vaccinated against covid

The largest study to date with over 35,000 attendees -women and people of gender diversity- confirmed that 42% of women experienced increased menstrual bleeding within two weeks get vaccinated against covid.

In addition, the study describes for the first time the occurrence of spontaneous bleeding in a high number of people who did not have periods -because they were menopausal or because they were following a hormonal contraceptive treatment or to change sex-, after having received the SARS-CoV-2 vaccine.

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 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 side effects associated with the vaccine (fever or fatigue), or a history of pregnancy and childbirth, among others.

“People who were menstruating and people who were menstruating started saying that experienced unexpected bleeding after receiving the vaccine in early 2021“, commented the North American researchers and directors of the study Katharine Lee, of Tulane University, and Kathryn Clancy, of the University of Illinois at Urbana-Champaign.

In vaccine trials, menstrual cycles or bleeding are usually not questioned, so this side effect is often overlooked or excluded from studies, despite the fact that some vaccinessuch as those of typhoid fever, hepatitis B and HPV, They can disrupt menstruation.

To do the study, the authors used a survey asking people about their experiences after receiving the covid vaccine.

the authors they only included data from people who had not had covid (because the disease can cause menstrual changes) and excluded data from people aged 45-55 to avoid results being confused with menopause or previous changes.

Thus, the study focused on menstruating people, postmenopausal women and people on hormonal therapies that suppress the cycle.

42.1% of respondents said they had heavier menstrual flow in the first two weeks after vaccination, 43.6% that their menstrual flow had not changed and 14.3% had experienced no change or , if any, less bleeding than usual.

The study found possible associations with reproductive history, hormonal status, demographics, and changes in menstruation of a person after vaccination.

For example, respondents who had been pregnant were the most likely to report heavier bleeding after vaccination, with a slight increase among those who had not given birth.

And more than 70% of respondents using long-acting reversible contraceptives and 38.5% of those taking gender-affirming hormone treatments reported this side effect.

Although menstrual disorders are not uncommon or dangerous, unexpected changes can indeed be cause for concern.

“Unexpected intermittent bleeding is one of the first signs of certain cancers in people who are postmenopausal and those who use gender-affirming hormones,” says Lee.

For this reason, “this screening is very important in order to be able to detect cancers in time”, explains Clancy.

The authors reiterate, however, that getting vaccinated is one of the best ways to prevent covid, hospitalization and death.

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