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Can the COVID-19 vaccine affect menstruation?
- By Toni Golen, MD, Contributor, and
- Hope Ricciotti, MD, Editor in Chief, Harvard Women's Health Watch
Ask the doctors
Q. My daughter read that COVID-19 vaccination might affect a woman’s menstrual cycle. Is there any truth to this?
A. A study published online Jan. 5, 2022, by Obstetrics and Gynecology suggests that on average, women experience a small (less than one day) increase in menstrual cycle length (counted in days from the start of one period to the start of the next) after COVID-19 vaccination, compared with pre-vaccination cycles. This variation is temporary and harmless, and there is no evidence that it affects a woman’s health or fertility. It should also not dissuade women from getting the vaccine, which is effective and safe.
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