Should we fear disturbances in our menstrual cycle when we are vaccinated once morest Covid-19? A new study estimates that while slight changes were observed, they were of no consequence to health.
At the end of December, the National Agency for Medicines and Health Products wanted to be very reassuring Concerns regarding the consequences of the Covid-19 vaccine on the menstrual cycle.
An American study, led by Alison Edelman, professor of obstetrics and gynecology at Oregon Health & Science University, confirms this: there is no ” clinically significant change in menstrual cycle length associated with Covid-19 vaccination».
To reach this conclusion, nearly 4,000 people, vaccinated and unvaccinated, participated :
“We included people residing in the United States between the ages of 18 and 45, with a cycle of normal duration (between 24 and 38 days) for three consecutive cycles before the first dose of vaccine, followed by cycles with the vaccine dose (cycle 4 through 6), or for unvaccinated people, for six cycles over a similar period of time. “
A little longer cycle … and that’s it
If there is any change, it is ultimately not very important for the people vaccinated: the period of menstruation remains unchanged, however we note a slight shift in the menstrual cycle, which is found to be lengthened by less than a day.
From minimal and inconsequential changes assures Alison Edelman in Today :
“It’s very reassuring. In the long term, you don’t see anything that might prevent someone from getting the vaccine. It just gives more information on what to expect. Now people can be told that they may have a slight change in the length of their menstrual cycle. “
Slight differences were observed depending on the time of vaccination: the changes would be more pronounced if the injection took place during the first part of the hormonal cycle (the follicular phase), from the onset of menstruation to ovulation.
According to the specialist, this is linked to the connections between the immune and reproductive system. It is certain that research on the Covid-19 vaccination will continue to provide us with new information on its impact.
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Photo credit : Mos.ru, CC BY 4.0, via Wikimedia Commons
