National Institutes of Health

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 menses (days of bleeding).

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

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