A recent study found a slightly higher risk of heavier periods after COVID-19 vaccination. Researchers emphasize that the changes are small and typically return to normal in the next menstrual cycle. A new international study finds that women vaccinated for COVID-19 have a slightly higher risk fo
has found that women vaccinated for COVID-19 have a slightly higher risk of experiencing a heavier period after vaccination. Researchers analyzed menstrual cycle data from 9,555 individuals, primarily from the US, Canada, UK, and Europe. Results showed a 4% increase in total bleeding quantity after the first vaccine dose, translating to 40 additional people per 1,000 experiencing more bleeding quantity. However, these changes typically resolved by the first post-vaccination menstrual cycle.
While there is a growing body of evidence demonstrating that COVID-19 vaccination is associated with a, other disturbances such as bleeding quantity are less well known. This study aimed to estimate the effect of COVID-19 vaccination on menstrual bleeding quantity among individuals with normal menstrual cycles.
Analyses showed a small — 4% — increase in the percentage of participants who experienced greater total bleeding quantity following the first COVID-19 vaccine dose compared with an unvaccinated comparison group. This difference translates to an estimated 40 additional people per 1,000 normally cycling individuals who experienced more bleeding quantity. Researchers also found that these changes typically resolved by the first post-vaccination menstrual cycle.
Individuals who notice prolonged changes in menstruation are encouraged to seek guidance from their clinician.
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