How do vaccines against corona affect the menstrual cycle?

Vaccines against the Corona virus appear to have a slight effect on the menstrual cycle, according to the results of a study in the United States. But researchers believe that the effect is temporary and will disappear later.

According to a recent American study, vaccination against corona can slightly delay the menstrual cycle in women.

According to the study published in the Journal of Obstetrics and Gynecology, the menstrual cycle begins about a day later in vaccinated women compared to non-vaccinated women.
However, the duration of the menstrual cycle was not affected. According to the researchers, the effect of vaccination on the menstrual cycle is minimal and may be temporary, citing the German T Online website.

The scientists evaluated data from an app used to monitor fertility in women aged 18 to 45 who are not using hormonal contraceptives.

About 2,400 women were vaccinated, most of whom had the Biontech/Pfizer vaccine (55 percent), followed by Moderna (35 percent) and Johnson & Johnson (seven percent).

Data from 1,500 unvaccinated women were used for comparison. The researchers compared data from three consecutive menstrual cycles, three before and three after vaccination.

For unvaccinated women, there were six consecutive menstrual cycles, according to dw.

On average, the first dose of the vaccine was associated with an increase in cycle length by 0.64 days and the second dose with an increase of 0.79 days, as reported by the German “T Online” website.

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