Recent Blog Articles
Why all the buzz about inflammation — and just how bad is...
What’s the right way to brush your teeth?
Want to stay healthy over the holidays?
How to help your preschooler sleep alone
21 spices for healthy holiday foods
New guidelines on opioids for pain relief: What you need to know
Should you get an over-the-counter hearing aid?
Shortage of ADHD medicines: Advice on coping if you are affected
When replenishing fluids, does milk beat water?
Melasma: What are the best treatments?
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.
To continue reading this article, you must log in.
Subscribe to Harvard Health Online for immediate access to health news and information from Harvard Medical School.
- Research health conditions
- Check your symptoms
- Prepare for a doctor's visit or test
- Find the best treatments and procedures for you
- Explore options for better nutrition and exercise
I'd like to receive access to Harvard Health Online for only $4.99 a month.Sign Me Up
Already a member? Login ».
As a service to our readers, Harvard Health Publishing provides access to our library of archived content. Please note the date of last review or update on all articles.
No content on this site, regardless of date, should ever be used as a substitute for direct medical advice from your doctor or other qualified clinician.
You might also be interested in…
Menopause and Perimenopause: Taking charge of the transition
Perimenopause is the long transition that precedes menopause. During this stage, your periods may become irregular and you may experience hot flashes and other changes.There are many things you can do to get through “the change” in the best shape possible. This guide will help you better understand the biological factors that underlie perimenopause and menopause and the symptoms you may experience. We’ll provide options on how to manage this change and offer advice about steps you can take now to ensure your long-term health.
Free Healthbeat Signup
Get the latest in health news delivered to your inbox!