Evidence suggests any alterations to women’s cycles ‘short-lived and small’
The first study drew on data from 3,959 Americans who logged at least six consecutive cycles on a tracking app. Of these, 2,403 were vaccinated while the remainder acted as a control group.
Most affected were the 358 individuals who received both doses of the vaccine in the same cycle, experiencing a 2.32-day delay to their next period – a scenario unlikely to have occurred inAmong this US group, 11 per cent experienced a change in cycle length of more than eight days, which is considered clinically significant, compared with 4 per cent in the unvaccinated group. In all groups, cycle lengths returned to normal by two cycles after vaccination.
The high level of variation in normal cycles is underlined by the initial finding that 38 per cent of participants reported at least one change from normal in pre-vaccination cycles, which increased to 39 per cent after the first vaccine dose and 41 per cent after the second. The most commonly reported post-vaccination change was a heavier than normal period.
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