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HomeUncategorizedWomen's Period May Be Slightly Late After Covid-19 Vaccine, Study Finds

Women’s Period May Be Slightly Late After Covid-19 Vaccine, Study Finds


A study funded by the US government found that women who were vaccinated against COVID-19 had a nearly one-day delay in their period compared to those who were not.

The number of days of bleeding, however, was not affected, according to the study, which was conducted on nearly 4,000 people and published in “Obstetrics & Gynecology.”

According to lead author Alison Edelman of Oregon Health & Science University, the effects are minor and expected to be transient, a finding that is “very reassuring” and “validating” for those who experienced changes.

The study may also be useful in combating anti-vaccine misinformation on social media.

The slight lengthening of the menstrual cycle is not clinically significant. The International Federation of Gynecology and Obstetrics considers any change lasting less than eight days to be normal.

Period cycles last about 28 days on average, but this varies from woman to woman and over the course of a person’s life. It can also change when under stress.

The researchers analyzed anonymized data from a fertility tracking app among women aged 18 to 45 who did not use hormonal contraception for their study.

Pfizer (55 percent), Moderna (35 percent), and Johnson & Johnson (25 percent) vaccinated the majority of the 2,400 participants (seven percent).

In addition, approximately 1,500 unvaccinated women were included as a control group.

Data from three consecutive cycles before vaccination and three more consecutive cycles, including the cycle or cycles in which vaccination occurred, were collected from the vaccinated group.

Data on unvaccinated people was collected for six consecutive cycles.


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