The Covid Vaxxes and the Menstrual Cycle By Mrs Vera West

The mainstream media, and medical journals are now admitting that claims made by numerous women on the internet, about changes to their menstrual cycle, are true, in part. A paper just published in the British Medical Journal, with a population of almost 20,000 women, fond only small changes in the variation of the cycle of covid vaxxed women. See, nothing to worry about. But there are reports of severe bleeding, women who have gone through menopause bleeding again, and other variations, that have not received discussion in the mainstream narrative. And, admitting that the sacred vaxxes can have any impact gives a lot away, since this has been denied for some time.

“Earlier in the pandemic, stories circulated about people noticing changes to their period after getting a COVID-19 vaccine.

Back when COVID-19 vaccines were still new, there was little information about how they impacted menstrual cycles, but now medical research is catching up. 

The latest offering is a new study published by British Medical Journal (BMJ) this week which looked at menstrual cycle data from nearly 20,000 participants across multiple countries.

It's an expansion of an earlier study of nearly 4,000 participants in the US.

In essence, this newer and larger study found that COVID-19 vaccines were associated with slight changes to menstrual cycles.

"These changes are small compared with normal variation and resolve in the cycle after vaccination, except in people who received both doses in one menstrual cycle," the researchers said. 

How did the study work?

Researchers looked at the data from consenting users of period tracking app Natural Cycles.

The app has users log temperature readings to determine their fertility status based on where they are in their menstrual cycle. 

The study had 19,622 participants all up, with 14,936 being vaccinated and 4,686 being unvaccinated. 

Each participant continued data from at least four menstrual cycles. 

For the vaccinated group, researchers looked at the three menstrual cycles prior to getting their first vaccine dose and subsequent consecutive cycles through to the cycle after their second shot. 

For the unvaccinated group, the researchers looked at the four to six consecutive cycles over a similar time period. 

What happened to periods after getting the vaccine?

The study found that, on average, participants' cycle length increased by less than a day — technically 0.71 days — after the first dose.  

After the second dose, the increase was 0.56 days. 

Participants who had both shots within a single cycle had a 3.91 day increase. 

But that was just the average — researchers said 6.2 per cent of vaccinated participants experienced a change in cycle length for eight or more days.

For the cycle after vaccination, cycle length had increased by an average of 0.02 days for participants who had one dose per cycle and and 0.85 days for two doses in one cycle.

While the average menstrual cycle is around 28 or 29 days, changes aren't uncommon. 

"Teenagers might have cycles that last 45 days, whereas women in their 20s to 30s might have cycles that last 21 to 38 days," a Victorian Department of Health fact sheet says

In fact, the International Federation of Gynaecology and Obstetrics says a variation in cycle length of less than eight days is normal.

"Our research was not designed to determine why these changes might happen; these changes are probably due to temporary vaccine-related activation of immune response but more research is needed," the researchers said. 

Did the vaccine type matter?

It doesn't look like it. 

"Cycle length changes due to COVID-19 vaccination appear similar across the different vaccine types," researchers said. 

They included nine vaccine types in the study, inlcuding mRNA and vector vaccines. 

  • Pfizer-BioNTech 
  • Moderna
  • Oxford-AstraZeneca
  • Covishield
  • Johnson & Johnson
  • Sputnik V
  • Covaxin
  • Sinopharm
  • Sinovac

Did they find anything about heavier periods?

This particular research doesn't go into that.

But it did say that, while cycle lengths increased, the number of bleeding days didn't.

"We found no differences in menses length in any group of vaccinated individuals, compared with the unvaccinated cohort," researchers said.

A different study published in July showed 42 per cent of its participants said they bled more heavily than usual after receiving a vaccine — but 44 per cent reported no changes. 

The study, which was based on a survey of nearly 40,000 participants, also looked at post-vaccination breakthrough bleeding for respondents who don't typically menstruate. 

Of those, 71 per cent of participants on long-acting reversible contraceptives had breakthrough bleeding, as did 66 per cent of postmenopausal respondents and 39 per cent of people on gender-affirming hormones.

"We emphasise that menstrual bleeding changes of this nature are generally not indicative of changes to fertility," researchers said. 

"Generally, changes to menstrual bleeding are not uncommon or dangerous, yet attention to these experiences is necessary to build trust in medicine."

But both studies only show an association between the vaccine and menstrual changes — not that the shots cause changes.

In a piece for The Conversation, PhD candidate in biological anthropology at University of Oxford Gabriella Kountourides said we needed clinical trials that followed people a longer period of time to make those kinds of conclusions.

What about period pain?

The Natural Cycles study didn't look into that either. 

The researchers said that's what studies should focus on next. 

"Future work should assess other aspects of changes to menstrual cycles, such as unexpected vaginal bleeding, menstrual flow and pain, and define the mechanism by which the post-vaccination menstrual changes described here occur," they said. 

Is there going to be more research about this?

The scientists behind the Natural Cycles study hope so. 

"Although small changes in menstrual characteristics might not be meaningful to clinicians and scientists, any perceived effect to a routine bodily function linked to fertility can cause alarm for those experiencing it, and can contribute to vaccine hesitancy," the said. 

"Even small changes, when unanticipated, can have a large adverse impact on the quality of life of people who menstruate and who experience episodes of social embarrassment, anxiety related to uncontained bleeding or fertility planning or prevention, and worry about what bleeding changes mean for their overall health.

"The absence of evidence about vaccines and menstrual health coupled with the long standing sex specific research inequities can also be interpreted by the public as a dismissal from the scientific and medical community."

Researchers in the July study also want work done in this area.

They want people to be armed with more knowledge about how their menstrual cycles could change when they get vaccinated so they're prepared. 

"Menstruation is seldom considered a variable during vaccine trials aside from determining last menstrual period as part of established protections against volunteers being or getting pregnant," they said. 

"Recognising and attending to this emerging phenomenon of bleeding changes can help bolster trust between people who menstruate and medical providers, which is an area that has a long history of medical misogyny and gaslighting.

"Current and historic focus on fertility and reproduction in research and clinical trials is insufficient for addressing the changes in bleeding patterns that cause concern in many people.

"We urge other researchers and funding bodies to increase investment in understanding queer, trans, and nonbinary menstrual experiences."”

Yes, that had to be worked in.

“Association between menstrual cycle length and covid-19 vaccination: global, retrospective cohort study of prospectively collected data


  1. Edelman1
  2. Emily R Boniface1
  3. Victoria Male2
  4. Sharon T Cameron3
  5. Eleonora Benhar4
  6. Leo Han1
  7. Kristen A Matteson5
  8. Agathe Van Lamsweerde4
  9. Jack T Pearson4and 
  10. Blair G Darney1
  11. Correspondence toDr Alison Edelman, Department of Obstetrics and Gynecology, Oregon Health & Science University, Portland, USA; This email address is being protected from spambots. You need JavaScript enabled to view it.


Objectives To identify whether covid-19 vaccines are associated with menstrual changes in order to address concerns about menstrual cycle disruptions after covid-19 vaccination.

Design Global, retrospective cohort study of prospectively collected data.

Setting International users of the menstrual cycle tracking application, Natural Cycles.

Participants 19 622 individuals aged 18-45 years with cycle lengths of 24-38 days and consecutive data for at least three cycles before and one cycle after covid (vaccinated group; n=14 936), and those with at least four consecutive cycles over a similar time period (unvaccinated group; n=4686).

Main outcome measures The mean change within individuals was assessed by vaccination group for cycle and menses length (mean of three cycles before vaccination to the cycles after first and second dose of vaccine and the subsequent cycle). Mixed effects models were used to estimate the adjusted difference in change in cycle and menses length between the vaccinated and unvaccinated.

Results Most people (n=15 713; 80.08%) were younger than 35 years, from the UK (n=6222; 31.71%), US and Canada (28.59%), or Europe (33.55%). Two thirds (9929 (66.48%) of 14 936) of the vaccinated cohort received the Pfizer-BioNTech (BNT162b2) covid-19 vaccine, 17.46% (n=2608) received Moderna (mRNA-1273), 9.06% (n=1353) received Oxford-AstraZeneca (ChAdOx1 nCoV-19), and 1.89% (n=283) received Johnson & Johnson (Ad26.COV2.S). Individuals who were vaccinated had a less than one day adjusted increase in the length of their first and second vaccine cycles, compared with individuals who were not vaccinated (0.71 day increase (99.3% confidence interval 0.47 to 0.96) for first dose; 0.56 day increase (0.28 to 0.84) for second dose). The adjusted difference was larger in people who received two doses in a cycle (3.70 days increase (2.98 to 4.42)). One cycle after vaccination, cycle length was similar to before the vaccine in individuals who received one dose per cycle (0.02 day change (99.3% confidence interval −0.10 to 0.14), but not yet for individuals who received two doses per cycle (0.85 day change (99.3% confidence interval 0.24 to 1.46)) compared with unvaccinated individuals. Changes in cycle length did not differ by the vaccine’s mechanism of action (mRNA, adenovirus vector, or inactivated virus). Menses length was unaffected by vaccination.

Conclusions Covid-19 vaccination is associated with a small and likely to be temporary change in menstrual cycle length but no change in menses length.





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Wednesday, 24 July 2024

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