A study has shown that a COVID shot can add an extra day to a woman’s menstrual cycle.
Those who received a dose of the vaccine during their menstrual cycle found that their cycle lasted up to a day, compared with those who were not vaccinated.
The study, funded by the National Institutes of Health (NIH) and led by Dr Alison Edelman from the Oregon Health and Science University in Portland, said the increase was “well within the normal range of fluctuations. “.
The study’s authors also point out that it’s not uncommon for menstrual cycles to vary from month to month.
Health officials have repeatedly said the Covid booster shots protect against Omicron and offer the best chance of weathering the pandemic.
The Sun’s Jabs Army campaign is helping to get key additional vaccines in British arms to avoid the need for any new restrictions.
Dr Edelman added that further research will be needed to determine how Covid punctures might affect other menstrual characteristics such as pain, mood swings and flow heaviness.
Diana Bianchi, director of the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) of the NIH, said: “It is reassuring that the study found only a small, temporary menstrual change. time in women.
“These results provide for the first time an opportunity to advise women on what to expect with the COVID-19 vaccine so they can plan accordingly.”
Dr. Bianchi went on to explain that small studies have been done on how Covid vaccines or vaccines against other diseases might affect the menstrual cycle.
To understand why the changes occurred, the study’s authors analyzed data from the fertility tracking app, Natural Cycles.
For accurate results, users are required to enter data on their temperature and menstrual cycle and can agree to use their unspecified data for research.
For vaccinated individuals, data were obtained from three consecutive cycles before they were immunized and from three other consecutive cycles, including the cycle or cycles in which they were vaccinated.
For unvaccinated individuals, their data were collected for six consecutive cycles.
Of the 3,959 individuals in the study, 2,403 were vaccinated and 1,556 were unvaccinated.
Most vaccinated app users received the Pfizer and Moderna vaccines.
On average, the first dose of vaccination was associated with a 0.71-day increase in cycle length and the second dose with a 0.91-day increase.
According to the experts, this means that users who were vaccinated in two cycles had less than a day’s rise in each of their vaccination cycles.
There was no change in menstrual bleeding days for those vaccinated, and the researchers found no significant change in cycle length for unvaccinated app users.
However, the 358 app users who received two doses of the vaccine in the same menstrual cycle, experienced a significantly larger average increase in their cycle length to two days.
According to the researchers, this change appeared to diminish in later cycles, which suggests that menstrual changes are temporary and should disappear within a short period of time.
Dr Bianchi and her team added that the International Federation of Gynecologists and Obstetricians classifies a change in cycle length as ‘normal’ if that change is less than eight days.
The study was published in the journal Obstetrics and Gynecology.
https://www.thesun.ie/health/8173686/covid-vaccines-extra-day-periods-menstrual-cycle/ Covid vaccine ‘could prolong menstruation by one day’ as study finds ‘temporary change’ for injectable women