The Guardian, June 4, 2021, by Nicola Davis

Any menstrual changes after Covid jab would be short-lived, experts say

Scientists responding to anecdotal accounts say there is no fertility risk and experiences are highly variable

Researchers exploring whether Covid vaccines may disrupt menstrual cycles have said any potential changes to periods are short-term and do not affect fertility.

Though any link between the jab and changes in periods is yet to be proven, anecdotal accounts have been highlighted in blogs and on social media.

Speaking to the Guardian’s Science Weekly podcast, Dr Kate Clancy, an associate professor at the University of Illinois, and Dr Katharine Lee, a postdoctoral researcher at Washington University School of Medicine, said they both experienced temporary changes to their menstrual cycles after receiving Covid vaccinations, leading them to start a survey to explore whether others had similar stories.

The results, they say, suggest the experience is highly variable.

“[Among those reporting changes] people on long-acting hormonal contraceptives, people on gender-affirming hormones and post-menopausal people were all reporting effectively surprise periods or breakthrough bleeding,” said Clancy.

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