A change in menstrual cycle length of eight days or less is considered within the normal range of variation, according to NIH.
A study funded by the NIH found that Covid vaccination was linked to a temporary increase in women's menstrual cycles by an average of less than a day.
Nearly 20,000 people participated in the study across Canada, the U.K., the U.S., Europe and other parts of the world who received one of nine different vaccines.vaccination is linked to a slight increase in the length of a women's menstrual cycle, delaying the beginning of bleeding by a few hours, according to a large international study funded by the National Institutes of Health.
Dr. Diana Bianchi, head of NIH's child health and human development institute, said the changes following vaccination appear small, temporary and within the normal range. However, the longer menstrual cycle, typically about a month long, didn't necessarily increase the number of days of bleeding, according to health agency.
A change in menstrual cycle length of eight days or less is considered within the normal range of variation, NIH said. Participants' menstrual cycles increased by an average of .71 days, or less than 24 hours, after the first vaccine dose and by just over half a day after the second dose, according to the study's findings. Women who received both vaccine doses in a single menstrual period saw their cycle increase by 3.91 days.
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