COVID vaccination has been linked to changes in the menstrual cycle in women, according to new research.
Dr. Alison Edelman of the University of Oregon and other researchers studied cycles in 2,403 vaccinated and 1,556 unvaccinated women and concluded that vaccination is associated with a change in cycle length.
The researchers said vaccines that use RNA technology – both Pfizer and Moderna – elicit an immune response that can temporarily affect the function of the hypothalamus-pituitary-ovarian axis.
Although the study did not find that vaccination was associated with changes in menstrual cycle length, “questions remain about other possible changes such as menstrual symptoms, unplanned bleeding, and changes in the quality and quantity of menstrual bleeding.”
The study was funded by the National Institutes of Health, which provided $1.6 million in grants to investigate the potential links between vaccinations and menstrual changes.
A study by the Public Health Institute in Norway found that many women report heavier periods than usual after being vaccinated against COVID.
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