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Finally, We Understand How Covid Vaccines Affected Time Periods | Must Read!


Since the epidemic began, many have wondered how COVID-19 affects menstruation. Women have reported alterations in their monthly cycles due to the stress of lockdowns, viruses, and immunizations.

Until recently, there was little to no data on the issue, but now data is emerging. Recent research from Natural Cycles looked at how the COVID-19 vaccines affected people’s periods.

This is a hot issue. In September 2021, the MHRA stated that over 30,000 women have reported abnormalities in their menstrual cycle after receiving the COVID-19 vaccination. After all three main immunizations, there was unusual bruising, delayed bruising, and bleeding (Moderna, AstraZeneca, and Pfizer).

The MHRA claimed it “does not support a relationship” between COVID vaccinations and symptoms after evaluating the cases. RCOG asked for greater study in response.

Today’s study comes from Natural Cycles (licensed as contraception by the FDA and costing £49.99 per year in the UK). It is likely to be the first of many published studies, however, there is a shortage of data on menstruation because the NHS does not collect data on women’s periods centrally in the UK. Period tracker apps have the most readily available and large-scale data, therefore they are the first to report.

The COVID-19 vaccinations changed cycle duration or period length, according to Natural Cycles research published today in Obstetrics & Gynecology (The Green Journal). It didn’t look at the above-mentioned adverse effects.


Researchers compared vaccinated (2,403) and unvaccinated (1,556) cycles. Vaccines were largely Pfizer-BioNTech (55%), Moderna (35%), and Johnson & Johnson (7%), and all participants were granted an agreement to utilize de-identified data.

People did change, according to the results. Following immunization, the total cycle duration changed by less than one day with no change in period length. For users who received two vaccination doses in the same cycle, Natural Cycles discovered that the average cycle duration increased by two days, but that these effects are only transient and appear to recover rapidly in following cycles.

Dr. Jack Pearson, principal researcher and on-staff medical expert at Natural Cycles, said the study is comforting considering the many issues surrounding the COVID-19 vaccine’s influence on the menstrual cycle and the lack of proof previous to our study. “The menstrual cycle is typically ignored and under-researched, despite its importance in a woman’s overall health.”

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Of course, there are caveats. First, this is exclusively a US-based Natural Cycles user survey. Second, averaging numbers flatten them. Natural Cycles informed Refinery29 that out of 4,000 customers, 400 had “a more dramatic shift”.

Vaccine-induced menstrual disruption, Dr. Pearson told Refinery29, “Menstrual cycle abnormalities are a typical sign of stress, illness, or changes in lifestyle and environment. While we don’t know why slight alterations happened after receiving the vaccination, it’s comforting to know that they were just transient. It also reinforces what many Natural Cycles users say: being able to trace their cycle so carefully is a wonderful tool.”

An earlier study from Natural Cycles indicated that pandemic-related stress had no effect on menstruation for the majority of their consumers. Ultimately, additional study and data on periods are necessary to fully comprehend the pandemic’s impact on women and menstruating persons.

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