Study confirms Covid vaccine increased menstrual bleeding in 42% of women

The largest study to date with over 35,000 attendeeswomen and people with gender diversity – confirmed that 42% of women experienced increased bleeding menstruation Within two weeks of vaccination against Covid.

In addition, the study describes for the first time the occurrence of spontaneous bleeding in a large number of people who did not have menstruation -because they were menopausal or because they were undergoing hormonal contraceptive treatment or for a gender change-, after having received the Covid-19 vaccine.

The conclusions of this study, published this Friday in the journal Scientists progressconfirm 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 shows that these alterations are temporary and are associated with certain triggering factors such as age, suffering from systemic side effects related to the vaccine. (fever or fatigue)or the history of pregnancies and deliveries, among others.

“Menstruating and menstruating individuals began reporting unexpected bleeding after receiving the vaccine in early 2021,” the US researchers and study leaders say. Katharine Lee of Tulane University and Kathryn Clancy of the University of Illinois at Urbana-Champaign.

In vaccine trials, menstrual cycles or bleeding are not usually questioned, so this side effect is often ignored or excluded from studies, despite the fact that some vaccines, such as those for 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 only included data from people who had not had covid (because the disease can cause menstrual changes) and excluded data from people between 45 and 55 years old to avoid results being confused with menopause or previous changes.

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

42.1% of respondents said they had heavier menstrual flow in the first two weeks after being vaccinated, 43.6% that their menstrual flow had not changed and 14.3% there had been no change or, conversely, less bleeding than usual.

The study detected possible associations with reproductive history, hormonal status, demographics and changes in a person’s menstrual period 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 who were using long-acting reversible contraceptives and 38.5% people undergoing gender-affirming hormone treatments have reported this side effect.

Although menstrual disorders are not uncommon or dangerous, unexpected changes can be concerning.

“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 it, “this screening is very important to be able to detect cancers in timeClancy notes.

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

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