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<div about="/news-events/nih-research-matters/covid-19-vaccines-linked-small-increase-menstrual-cycle-length" typeof="sioc:Item foaf:Document" class="ds-1col node node--nih-research-matters view-mode-full node--full node--nih-research-matters--full clearfix">
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<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2022-01-25T00:00:00-05:00" class="date-display-single">January 25, 2022</span></p><div class='syndicate'><h1>COVID-19 vaccines linked to small increase in menstrual cycle length</h1><div class="callout callout-with-border"><h3>At a Glance</h3>
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<li>Women who received COVID-19 vaccines had a less than one-day increase in the length of their menstrual cycles around the time of their doses. </li>
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<li>The findings suggest that women may have a slightly longer menstrual cycle after COVID-19 vaccination, but the change is temporary and within the range of normal variation.</li>
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</ul></div><div class="media-float-right"><div class="ds-1col file file-image file-image-jpeg view-mode-floated_media clearfix">
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<picture title="Young black woman with bandage from vaccination">
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-large/public/news-events/research-matters/2022/20220125-vaccine.jpg?itok=mg3LD_Je&timestamp=1643054163 1x" media="screen and (min-width: 960px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2022/20220125-vaccine.jpg?itok=L4htM8pp&timestamp=1643054163 1x" media="screen and (min-width: 800px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium-small/public/news-events/research-matters/2022/20220125-vaccine.jpg?itok=uN6uQyr_&timestamp=1643054163 1x" media="screen and (min-width: 600px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-small/public/news-events/research-matters/2022/20220125-vaccine.jpg?itok=CSKcBiTp&timestamp=1643054163 1x" media="screen and (min-width: 480px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-tiny/public/news-events/research-matters/2022/20220125-vaccine.jpg?itok=mVr-tGpX&timestamp=1643054163 1x" media="screen and (min-width: 0)" />
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<img src="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2022/20220125-vaccine.jpg?itok=L4htM8pp&timestamp=1643054163" alt="Young black woman with bandage from vaccination" title="Young black woman with bandage from vaccination" />
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</picture><span class="caption">Researchers found little effect of COVID-19 vaccinations on menstrual cycles. </span><span class="credit">Prostock-studio / Shutterstock</span></div>
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</div><p>COVID-19 vaccination is recommended for all women, including those who are pregnant or may become pregnant in the future. It reduces the risk of getting severely ill from the virus and helps protect both mother and child during pregnancy. However, concerns about the vaccine’s possible effects on menstruation have made some hesitant to get vaccinated.</p>
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<p>Women have reported menstrual changes after receiving the COVID-19 vaccine both on social media and through official channels for documenting adverse vaccine events. But these reports represent only a small portion of vaccinated women and vary in the menstrual changes reported.</p>
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<p>A team of researchers led by Dr. Alison Edelman of Oregon Health & Science University explored whether COVID-19 vaccines cause changes to menstrual cycles. They compared menstrual cycle length (time between bleeding) and menses (days of bleeding) in vaccinated and unvaccinated women.</p>
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<p>The study was funded by NIH’s Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) and Office of Research on Women’s Health. Results appeared in <em>Obstetrics & Gynecology</em> on January 5, 2022.</p>
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<p>The team analyzed data from nearly 4,000 women, ages 18 to 45, collected through a fertility tracking app. Participants agreed to have their data used for research purposes. All the women had normal cycle lengths, from 24-38 days. Data was compared for three menstrual cycles before the first vaccine dose to the three cycles afterward. Among unvaccinated women, data was collected for six consecutive cycles. Most of the vaccinated participants (55%) received the Pfizer-BioNTech vaccine, 35% received the Moderna vaccine, and 7% received the Johnson & Johnson/Janssen one.</p>
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<p>The team found that women who received a COVID-19 vaccine had an average increase in cycle length of nearly one day for each dose. Among women who received a two-dose vaccine, the first dose was associated with a 0.71-day increase in cycle length and the second dose with a 0.91-day increase. After adjustment for age, race and ethnicity, BMI, education, and other factors, the change in cycle length was still less than one day for each dose.</p>
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<p>Receiving two vaccine doses within the same menstrual cycle increased the cycle length further—about two days on average. Women’s cycle lengths often fluctuate, and experts consider cycle variation of up to eight days to be normal. The longer menstrual cycles after vaccination decreased in subsequent cycles, suggesting they are likely temporary. The researchers did not find any effect of COVID-19 vaccination on the number of menstrual bleeding days.</p>
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<p>“It is reassuring that the study found only a small, temporary menstrual change in women,” says NICHD Director Dr. Diana Bianchi, “These results provide, for the first time, an opportunity to counsel women about what to expect from COVID-19 vaccination so they can plan accordingly.”</p></div><h2 class="label-above">Related Links</h2><ul class="spaced print-urls"><li><a href="https://www.nih.gov/news-events/nih-research-matters/measuring-protection-after-covid-19-vaccination" target="_top">Measuring Protection After COVID-19 Vaccination</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/moderna-covid-19-booster-may-protect-against-variants" target="_top">Moderna COVID-19 Booster May Protect Against Variants</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/moderna-covid-19-vaccine-generates-long-lasting-immune-memory" target="_top">Moderna COVID-19 Vaccine Generates Long-Lasting Immune Memory</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/vaccines-prevented-140000-covid-19-deaths-us" target="_top">Vaccines Prevented up to 140,000 COVID-19 Deaths in U.S.</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/intranasal-covid-19-vaccine-effective-animal-studies" target="_top">Intranasal COVID-19 Vaccine Effective in Animal Studies</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/immune-response-vaccination-after-covid-19" target="_top">Immune Response to Vaccination After COVID-19</a></li><li><a href="https://covid19.nih.gov/" target="_top">Coronavirus (COVID-19)</a></li><li><a href="https://www.coronaviruspreventionnetwork.org/" target="_top">Coronavirus Prevention Network</a></li><li><a href="https://www.coronavirus.gov/" target="_top">Coronavirus (COVID-19) (CDC)</a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="https://pubmed.ncbi.nlm.nih.gov/34991109/">Association Between Menstrual Cycle Length and Coronavirus Disease 2019 (COVID-19) Vaccination: A U.S. Cohort.</a> Edelman A, Boniface ER, Benhar E, Han L, Matteson KA, Favaro C, Pearson JT, Darney BG. <em>Obstet Gynecol</em>. 2022 Jan 5. doi: 10.1097/AOG.0000000000004695. Online ahead of print. PMID: 34991109.</p><p class="footnote"><strong class="label-inline">Funding: </strong>NIH’s Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) and Office of Research on Women’s Health.</p>
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<p><a href="https://www.nih.gov/news-events/nih-research-matters/research-context-can-we-slow-aging">Research in Context: Can we slow aging?</a></p>
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<p><a href="https://www.nih.gov/news-events/nih-research-matters/risk-future-burden-dementia-united-states">Risk and future burden of dementia in the United States </a></p>
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<p><a href="https://www.nih.gov/news-events/nih-research-matters/complete-wiring-map-adult-fruit-fly-brain">Complete wiring map of an adult fruit fly brain</a></p>
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<p><strong>Editor:</strong> Harrison Wein, Ph.D.</p>
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<p><strong><em>NIH Research Matters </em></strong>is a weekly update of NIH research highlights reviewed by NIH’s experts. It's published by the <a href="/institutes-nih/nih-office-director/office-communications-public-liaison">Office of Communications and Public Liaison</a> in the <a href="/institutes-nih/nih-office-director">NIH Office of the Director</a>.</p>
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