COVID-19 vaccines linked to temporary changes in menstrual cycle, new study confirms – CTV

Sept. 28, 2022

Researchers have been observing the various effects of the COVID-19 vaccine on menstrual cycles since many menstruating people began reporting changes following vaccination. Now, a new global study confirms the link between a temporary increase in the menstrual cycles of some individuals as a result of the COVID-19 vaccine.

The study, conducted by the U.S.-based National Institute of Health, found that the increase in cycle length resolved for most of the nearly 20,000 study participants following vaccination.

The international study included participants from Canada, the United Kingdom, the United States, Europe, and other areas of the globe who received any of nine different COVID-19 vaccines.

The study examined at least three consecutive menstrual cycles prior to vaccination, and at least one cycle following. Of the 19,622 participants, 14,936 were vaccinated and 4,686 were not. For the unvaccinated participants, the researchers looked at at least four consecutive cycles of a similar interval.

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