More than a year ago, data began to appear on the possible interference between vaccination against Covid and menstruation. In Spain, a study involving 1,600 women provided clear preliminary data, which the vaccine changed the rule in six out of 10 cases.
Subsequently, studies were added in the field of pharmacovigilance, the The Spanish Agency for Medicines and Health Products has even declared that there are not enough relationships between vaccination with AstraZeneca (the first that women of childbearing age began to receive) and changes in menstruation. Next, reexamined the relationship.
However, other studies have looked at this relationship and, beyond the vaccine, with the disease and with persistent Covid. Indeed, changing the menstruation is one of the 200 symptoms that have been cataloged in Spain in the long covid.
To the above evidence is now added a macro-survey with more than 39,000 results which is published in Scientists progress. In 90% of the cases, the respondents were called women and in 9.1% as gender diverse.
The main finding of this study is that 42% of respondents who had regular menstrual cycles bleed more heavily after vaccination. According to the study, among those most likely to have this happen were those who were premenopausal, Hispanic or Latino, those who had been pregnant and those who suffered from gynecological conditions such as endometriosis or ovarian syndrome. polycystic.
On the other hand, among respondents who usually missed their periods – due to taking reversible contraceptives or gender-affirming hormones. Even, the study says, women who were already in menopause experienced bleeding. “In general, changes in menstrual bleeding are common and not dangerous, but attention to these experiences is necessary to foster confidence in medicine,” write Katharine Lee and her team, stressing in a press release the need to put the menstruation at science center. .
From Spain, two researchers on this same question are Ana Beatriz Rodríguez Moratinos, professor of physiology at the University of Extremadura, and Cristina Carrasco, postdoctoral researcher, both from the Neuroimmunophysiology and Chrononutrition group of the said university. Science Media Center Spain that this study is pioneering both in terms of the subject and the number of participants. This study “describes for the first time the occurrence of spontaneous bleeding in a high percentage of non-menstruating people, either due to menopause or hormonal contraceptive and transgender treatments, after inoculation with the SARS-CoV-2 vaccine. The data obtained indicate that these alterations would be temporary and that among the factors significantly influencing their appearance would be age, the fact of suffering from systemic side effects related to the vaccine (fever and/or fatigue), history of pregnancy and childbirth and ethnic origin, among others.
For the researchers, this research “sheds light on a phenomenon initially vilified by society in general and whose scientific evidence will be enriched in the months to come with the publication of other similar studies, in particular those carried out in countries with high rates of vaccination of the population, like Spain”.