Covid19. Study reveals how vaccination influences menstruation

NopeIt is not the first time that the relationship between vaccination, against Covid-19, and menstruation has been mentioned – among the most recorded secondary symptoms are changes in the menstrual cycle -, however, experts say it there is no need to be alarmed. . Now the largest study to date has been published that examines this relationship in more detail.

Nearly half of study participants with regular periods reported experiencing more intense blood loss in cycles that occurred after SARS-CoV-2 vaccination.

In addition, people who do not have regular periods feel the effects and complain of abnormal blood loss. This group includes transgender people, post-menopausal women and those who choose long-acting contraceptive methods, such as the IUD.

This new study, available onlinebuilds on research that previously highlighted the temporary effects of these vaccines on menstrual cycles and which, until now, focused only on cisgender women with regular periods, explains the New York Times.

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The team of American researchers – made up of experts from the University of Illinois and the Washington University School of Medicine – distributed an online questionnaire, in April 2021, to thousands of people, in different parts of the world. .

After three months, he was able to collect and analyze responses on the menstrual cycle of nearly forty thousand people aged 18 to 80. All of the people who responded had been vaccinated with vaccines from Pfizer-BioNTech, Moderna, Johnson & Johnson, among others. approved outside the United States of America.

The results, published last week, concluded that 42% of people with regular menstrual cycles experienced increased blood loss after being vaccinated against Covid-19. Already 44% felt no difference and 14% had lighter periods.

Additionally, 39% of participants taking hormone treatments, 71% of those on long-acting contraceptives, and 66% of postmenopausal women also experienced increased blood loss after one or both vaccines.

For the researchers, this information is important so that women are not caught off guard and afraid if they experience a stronger menstrual cycle. Additionally, the team emphasizes that unvaccinated individuals were not analyzed and therefore further investigation is needed, however these results are consistent with those published in previous studies.

The study also managed to conclude which age groups are most likely to suffer from these secondary symptoms, namely the elderly. This has also been proven in people who use hormonal contraceptives, have been pregnant, or have been diagnosed with conditions such as endometriosis, fibroids, or polycystic ovary syndrome.

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Why does vaccination influence menstruation? Some variation in the menstrual cycle is completely normal, the New York Times explains, because we’re not talking about a “perfect clock.”

Hormones released by the hypothalamus, pituitary and ovaries regulate the monthly cycle and can be affected by internal and external factors. “Stress and illness, weight loss or gain, calorie restriction, and strenuous exercise can alter typical menstrual patterns.”

The endometrium, which lines the uterus and sheds during menstruation, has also been linked to the immune system, thanks to its important role in renewing uterine tissue and protecting against different conditions.

Bearing this in mind, it is possible that when vaccines enter the body and activate the immune system – its correct function – they will somehow have different effects on the endometrium and cause a disruption of the menstrual cycle.

The study also indicates that some women’s periods came late after vaccination, a temporary change with no associated negative consequences.

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