Study confirms link between COVID-19 vaccination and temporary increase in menstrual cycle length

 A large international study has confirmed the findings of a previous U.S. study that linked COVID-19 vaccination with an average increase in menstrual cycle length of less than one day. The increase was not associated with any change in the number of days of ****** (days of bleeding

Researchers analyzed de-identified data from the fertility tracking app Natural Cycles

• A total of 19,622 individuals participated in the study. Of these, 14,936 were vaccinated and 4,686 were not.
• Of the total, 1,342 participants experienced a change in cycle length of eight or more days, comprising 6.2% of vaccinated individuals and 5.0% of unvaccinated individuals.

About the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD):

• leads research and training to understand human development, improve reproductive health, enhance the lives of children and adolescents, and optimize abilities for all.
• NIH is the primary federal agency conducting and supporting basic, clinical, and translational medical research, and is investigating the causes, treatments, and cures for both common and rare diseases.

https://www.nih.gov/news-events/news-releases/study-confirms-link-between-covid-19-vaccination-temporary-increase-menstrual-cycle-length