Nishmat's Women’s Health and HalachaIn memory of Chaya Mirel bat R' Avraham

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Staining after Corona booster

6 December, 2021


Thank you so much for this service! I have been skipping my periods with continuous birth control for several months. Sometimes I get some light staining so I always wear black underwear etc. This past Monday, I got the coronavirus vaccine booster (shot 3) as I work in a hospital setting. On Wednesday, I got some staining but it was heavier than usual. I made sure to continue to be careful to wear black underwear, not look at toilet paper etc., but the staining has been going on for a few days, accompanied by cramping. I am worried that it will get worse. If it turns into a flow (which I am unsure of how to gauge), when would I start counting the five day minimum? Thank you again!


Medical consensus is that the Corona vaccine and booster may slightly affect a woman’s cycle, but that any effects are short term.

The 5 day minimum begins when you consider yourself niddah. If the staining becomes heavy enough that you need a tampon or full pad to contain the bleeding, you should assume you are niddah. If a light pantyliner is sufficient, you may continue treating it as staining.

Please feel free to get back to us with any further questions.


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