Covid-19 Vaccination Makes Menstrual Cycle Longer, Expert: No Need to Worry
A recent study revealed that after getting a dose of the Covid-19 vaccine, women had an average menstrual cycle length of about one day longer than usual. These findings validate claims by some women on social media that the Covid-19 vaccine affects their menstrual cycles.
Even so, experts say if these changes are not clinically significant. Therefore, people are asked not to worry.
"Essentially, we really think these findings are reassuring for health and reproductive health," said researcher Dr. Allison Edelman, an OB/GYN and professor at Oregon Health & Science University, Portland who is also the lead author of the study, told CNN .
He adds, there is an individual relationship with the menstrual cycle that is more than just clinical. And the results of this study provide concrete information to help people understand what might be happening, just like any other side effect.
The researchers emphasized that the increase in average menstrual cycles appeared to be mostly felt by women who received a dose of the mRNA vaccine, either Pfizer/BioNTech or Moderna, in one menstrual cycle.
The study found that in this group, the average cycle length increased by two days. But these changes are only temporary and can recover in a few months. There is not enough data to say how long the changes last in other women.
The menstrual cycle itself can be influenced by daily life, environment and health stressors. The researchers ruled out pandemic-related stress as a cause of change. But they note that the mRNA vaccine creates a similarly strong immune response that can temporarily affect menstrual cycle regulation.
The researchers write that a severe acute illness, such as Covid-19, can be catastrophic to this regulation, sometimes permanent. Overall, only about 5 percent of vaccinated women experienced a clinically significant change in menstrual cycles longer than eight days.
Dr Dianna Bianchi, director of the NIH Eunice Kennedy Shriver National Institute of Child Health and Human Development, told CNN that on one hand, the study validates what some women are saying on social media.
"But overall, at the level of population health, this slight change is actually not clinically significant. It shouldn't affect fertility, and the benefits of being vaccinated against and not getting Covid – even the mild version of the Omicron variant – are far greater. You shouldn't hesitate to get vaccinated," Bianchi said.
The study, which was conducted on about 4,000 women who used the Natural Cycles app to track menstruation, did not specifically address fertility or other possible changes in the menstrual cycle, such as symptoms or unscheduled bleeding.
The researchers analyzed data only from women who typically had regular menstrual cycles, but they noted that many did not fit into this category. (*)
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