Does the covid-19 vaccine affect menstruation?

Le vaccin contre la covid-19 impacte-t-il les règles ?

After several months of vaccination campaigns, cases of menstrual cycle disruption have been reported to the French national drug safety agency. Many of our customers asked us for feedback on vaccination and the impact of the vaccine on menstruating patients. We carried out a survey of 7517 people to study the impact of vaccination on menstruation and the menstrual cycle.

Of the 7517 respondents, 32% experienced menstrual disorders after the vaccine injection. Conversely, 68% of respondents had no menstrual disorders following injection of the covid-19 vaccine.

Among the 32% who did experience menstrual disorders following injection of the vaccine, 17% menstruated earlier, 21% menstruated more painfully in the following cycle, 19% menstruated more heavily and 22% menstruated later than expected.

Sources: Elia survey - August 2021

Several of our customers testify:

"I was supposed to have my period until Saturday, but it stopped on Tuesday, the day I was vaccinated, even though I've always had very regular cycles", "I had spotting after my vaccine doses!", "Since the vaccine, I lose 2 drops on the 1st day of my period and then nothing!", "After my first dose, my cycle lasted 37 days instead of the usual 27" or "My period still hasn't started, I'm almost 60 days...".

So where do these problems come from?

Although nothing has been proven and set in stone, at present, several theories put forward the fact that since the uterine mucosa is part of the immune system (since there are immune cells in virtually every part of the body), after being vaccinated, many chemical signals (which can have an impact on immune cells) circulate in the body. This can cause loss of the uterine lining, leading to bleeding or earlier menstruation.

These cells are essential for the construction, maintenance and destruction of the uterine lining, which will thicken in preparation for pregnancy and then be eliminated by menstruation when the egg is not fertilized.

However, it is important to stress that no link with the risk of miscarriage has been established. Similarly, the link between vaccination and impact on the menstrual cycle has not been scientifically proven.

There's no reason to worry about these menstrual cycle disruptions. In fact, when you vaccinate, it activates your immune system and creates inflammation.

Source :

Our collection of menstrual briefs is ideal for living your period with peace of mind, especially when it's disturbed by spotting, heavier white discharge or irregular cycles.

Back to blog

Our best sellers

1 of 8

The information contained in the articles on is general information only. Although reviewed by health professionals, this information is not error-free, does not constitute health advice or consultation, and is not intended to provide a diagnosis or suggest a course of treatment. Under no circumstances may this information be used as a substitute for medical advice or consultation with a healthcare professional. If you have any questions, please consult your doctor.