Does the COVID-19 vaccine affect menstruation?

Question: 

Does the COVID-19 vaccine affect menstruation?

Answer: 

Some people have reported changes to their menstrual cycle after getting the COVID-19 vaccine.

The Society of Obstetricians and Gynaecologists of Canada have noted the following:

  • The menstrual cycle is a complicated process impacted by multiple factors including sleep, stress, infection, diet, and exercise.
  • Getting COVID-19 itself can impact the menstrual cycle with more than 35% of women and persons who get COVID-19 noting changes in their menstrual cycle after infection. In the UK over 41 million doses of COVID-19 vaccines have been given with only 21 680 (0.0005%) of women per dose reporting changes in the menstrual cycles.
  • Other vaccines have not impacted the menstrual cycle.
  • Studies to determine if the impact of the COVID-19 vaccine on menstrual cycle are ongoing, and if it does impact the menstrual cycle we would expect it to be limited to 1-2 cycles.
  • Having a severe illness such as COVID-19 does impact the menstrual cycle and can impact the menstrual cycle for much longer.
  • COVID-19 vaccines do not cause infertility and there is no scientific reason to believe that they will cause infertility. Recent studies have shown that they do not impact fertility.

If you have any concerns about your menstrual cycle, please speak with your healthcare provider.

 

Date last reviewed: 
Tuesday, Oct 25, 2022