TEMPO.CO, Jakarta – After the coronavirus vaccine was launched about a year ago, many women started reporting irregular menstrual cycles. Some said their period was late, others reported bleeding that was heavier than usual. The average delay is only one day. Some postmenopausal women who have not menstruated for years even admit that they have menstruated again.
A study published in the journal Obstetrics & Gynecology, Thursday, January 6, 2022, found that women’s menstrual cycles do change after menopause. Covid-19 vaccination. The authors reported that the women who were injected had slightly longer menstrual cycles after receiving the vaccine than those who were not vaccinated.
However, the effects are temporary, with cycle lengths returning to normal within a month or two. For example, a person with a 28 day menstrual cycle will last for 29 days. The cycle ends when the next period begins and returns to 28 days in a month or two.
The delay was more pronounced in women who received both doses of the vaccine during the same menstrual cycle. These women had their periods two days later than usual, according to the researchers.
The study is one of the first to support reports from women that their menstrual cycles stop after vaccination, said Hugh Taylor, chair of the department of obstetrics, gynecology and reproductive sciences at Yale School of Medicine.
“I want to make sure we’re preventing people from having untrue myths about fertility effects,” says Taylor. “One or two irregular menstrual cycles may be bothersome, but medically it’s not dangerous.”
For postmenopausal women who experience vaginal bleeding or spotting, whether after vaccination or not, she warns that they may have a serious medical condition and should be seen by a doctor.
One of the serious drawbacks of this study is that it focuses on the US population, that the sample is not nationally representative, and cannot be generalized to the population at large. The data is provided by a company called Natural Cycles which makes an app to track fertility. Its users are more likely to be white and college-educated than the overall US population; they were also thinner than the average woman, and did not use hormonal contraception.
Study This was done by researchers at Oregon Health & Science University and Warren Alpert Medical School of Brown University, in collaboration with researchers from Natural Cycles, whose app is used by millions of women around the world.
The findings of the new study may not apply equally to all women. Indeed, most of the change in cycle length was driven by a small group of 380 vaccinated women who experienced a change of at least two days into their cycle, said Alison Edelman, a professor of obstetrics and gynecology.
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