Does the anti-Covid vaccine have an impact on the menstrual cycle? Thousands of women have asked themselves the question around the world and an American study brings rather reassuring conclusions.
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Staggered cycles, periods more painful or more important than usual: different types of disturbances of the menstrual cycle have been reported to health authorities, in France and abroad, after the vaccination against Covid-19. But a recent study published in the journal Obstetrics and Gynecology, provides reassuring elements: the figures show a correlation between the vaccination of cycle disturbances, but these changes are temporary and not serious, indicates this analysis carried out among 4,000 women aged 18 to 45 years.
According to these American data, the menstrual cycle can be lengthened slightly, by just under a day. Right after receiving a Covid-19 vaccine, your period may therefore occur a little later than usual but its duration is not changed. According to the authors of the study, this is a temporary disturbance, and not serious. Doctors point out that on a cycle that lasts an average of 28 days, any change of less than eight days can be considered normal.
These disturbances are therefore short-lived: how can they be explained? It is known that stress can cause cycle disturbances, as well as an inflammatory reaction, which can be the case with a vaccine. In France, the National Medicines Safety Agency (ANSM), however, indicates in its latest vaccine monitoring point that the direct cause and effect link has not been established between these disturbances of the menstrual cycle and the injection against Covid. These reports remain nevertheless under surveillance in France, and the drug agency advises the women concerned to consult a doctor if their disorders persist over several cycles.