Anti-Covid vaccination: The impact on the menstrual cycle… insignificant

Rest assured ladies, “vaccination has ‘almost’ no impact on the menstrual cycle,” says Dr. Tayeb Hamdi. Overall, it’s associated with less than a day’s change, he adds, based on the results of a recent US study published in the journal Obstetrics and Gynecology.

“No clinically significant change in menstrual cycle length associated with Covid-19 vaccination. The lengthening of the cycle observed in some women remains very limited and temporary”. This is confirmed by a recent American study published this month in the journal “Obstetrics and Gynecology” and which comes to put an end to widespread rumors sowing panic among the populations concerned. In the opinion of Dr. Tayeb Hamdi, a medical researcher in health policies and systems, “this American study which has recently looked into the subject has shown that vaccination has almost no impact on the menstruation cycle” . In detail, the conclusions drawn from this analysis reveal that the impact of anti-Covid vaccines on the menstrual cycle is not serious, very short-lived and naturally self-limiting over the next few months. “Anti-Covid vaccination, according to this study, does not significantly increase the duration of menstruation. It may be associated with a lengthening of less than one day: from 0.64 days for the first dose to 0.79 for the second”.

Conclusions likely to reassure women who are still reluctant to get vaccinated. It should be noted that the duration of the rules, just like the length of the cycle, is very variable from one woman to another. Generally, the average cycle is 28 days. “But any change less than eight days can be considered normal,” sums up the doctor, sharing the study’s findings. Our interlocutor also wishes to clarify that “this supposed relationship between vaccination against Covid-19 and menstrual cycle disorders does not date from today. The question has been raised since the launch of the anti-Covid vaccination operation, especially with messenger RNA vaccines”. One thing is certain, according to Dr. Hamdi: problems related to menstruation are common among women even before the pandemic and anti-Covid vaccines. “Menstrual pain or dysmenorrhea; cycle lengthening or shortening; amount of blood lost during menstruation or heavy menstrual influx… the factors associated with menstruation disruption are legion and vary from one subject to another”, explains Dr. Hamdi who recalls, in the same vein, that “the initial observations and statistics, in particular those carried out in France, did not reveal any link between the frequency of these disorders and anti-Covid vaccination”.

Still according to the health policy and systems researcher, menstrual disorders can also be explained by other factors, namely the emotional state of the person, associated with stress, depression or anxiety. Added to this are certain medical treatments which can also disrupt the menstrual cycle in a reversible manner. Note that American analysts have examined the duration of the cycles of 2,400 vaccinated people – with Pfizer (55%), Moderna (35%) and also with Johnson & Johnson (7%) – and 1,500 other unvaccinated. The study was based on the collection of data from an application for monitoring the menstrual cycle of these women aged 18 to 45 years.


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