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Many women have reported changes to their periods after a Covid-19 vaccination and the US National Institutes of Health has allocated more than $1.6 million dollars for research into a possible connection.

Now, two new observational studies published in the British Medical Journal provide reassuring data, suggesting that any changes are short-lived and small compared with natural variation in normal menstruation cycles.

Victoria Male, a lecturer and reproductive specialist at Imperial College London has looked at these findings.

Image: Woman receiving vaccine. Credit: PA