According to a study funded by the National Institutes of Health, women who received one COVID-19 vaccine during one menstrual cycle had a cycle length of approximately one day compared to unvaccinated women. Increased. Increased cycle length (longer time between bleeding) was not associated with changes in the number of days of menstruation (days of bleeding).The study will be displayed in Obstetrics and gynecology..
The author, led by Alison Edelman, MD, MPH of the Oregon Health & Science University in Portland, said that the menstrual cycle usually changed slightly from month to month, and the increases they saw were within normal fluctuations. They determine how COVID-19 vaccination affects other menstrual features such as associated symptoms (pain, mood changes, etc.) and bleeding features (including flow weight). Added that additional research is needed.
Diana W. Bianchi, MD, director of the NIH Eunice Kennedy Schreiber National Institutes of Health and Human Development (NICHD), said: “These results provide an opportunity to advise women on what to expect from COVID-19 vaccination for the first time so that they can plan accordingly.”
Dr. Bianchi added that little research has been done on how COVID-19 vaccines and vaccines for other diseases can affect them. Menstrual cycle..
The authors of the study analyzed anonymized data from the birth tracking app, Natural Cycles. Users can enter data about body temperature and menstrual cycle and agree to use the anonymized data for their studies.for Vaccinated individualsThe data were from three consecutive cycles prior to vaccination and three more consecutive cycles, including one or more cycles in which vaccination took place. For unvaccinated individuals, data were collected in 6 consecutive cycles. Of the 3,959 people who participated in the study, 2,403 were vaccinated and 1,556 were unvaccinated.
Most vaccinated users have been vaccinated with Pfizer and Moderna. On average, the initial vaccination dose is cycle length. The second vaccination is associated with an increase in the 71-day cycle. It was associated with a 91-day increase. Therefore, users vaccinated over two cycles had an increase of less than one day in each vaccination cycle. There was no change in the number of days of menstrual bleeding in vaccinated individuals. Researchers have seen no significant changes in the cycle length of unvaccinated app users.
Two subgroups of app users who received vaccination Dose for the same menstrual cycle (358 users) showed a larger average increase in the length of the 2-day cycle. However, this change appears to diminish in subsequent cycles, indicating that the change in menstruation is likely to be temporary.The authors added that it is classified by the International Obstetrics and Gynecology Association. variation of cycle Normal length if change is less than 8 days.
Edelman, A. et al. Relationship between menstrual cycle length and coronavirus disease 2019 (COVID-19) vaccination: US cohort. Obstetrics and gynecology (2022). DOI: 10.1097 / AOG.0000000000004695
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