health

One in 5 women in survey said menstrual cycles changed after Covid jab



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ne in five women who took part in a survey said their menstrual cycles were affected after they received a covid jab, UK researchers have revealed.

However there was no evidence of the vaccine causing long-term disruption to their periods or affecting their fertility.

The draft study suggested women who were on the contraceptive pill were almost 50 per cent less likely to notice any changes to their period.

But the odds increased by 49 per cent for women who smoked and by up to 70 per cent for those who had contacted covid or were suffering from long covid.

The research, which was based on self-reported evidence from almost 5,000 women who responded to a Facebook survey, was said by its authors to provide “reassuring data” because 80 per cent reported no changes.

But the researchers, from Oxford, Edinburgh and Bristol universities, said clinicians should consider counselling women about possible side-effects and advising them to seek medical advice if the symptoms were severe, lasted more than one cycle or involved bleeding between periods or after sex.

The UK’s drugs watchdog, the Medicines & Healthcare products Regulatory Agency (MHRA), and two other independent quangos are reviewing reports of suspected side-effects menstrual disorders after covid vaccination.

The MHRA says evidence to date “does not support a link” between the vaccine and changes to periods.

But a growing number of women have come forward to flag concerns. By November 10, the MHRA had been alerted through its “yellow card” scheme to 41,509 suspected reactions relating to a variety of menstrual disorders “including heavier than usual periods, delayed periods and unexpected vaginal bleeding”.

These reports relate to all three vaccines offered in the UK. The researchers said prior covid infection may heighten the body’s immune response to the vaccine, with a knock-on impact on menstruation, though this has yet to be proved.



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