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

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Long cycles

21 July, 2019


Hi, I was wondering if you can help me please. As a teenager, I had a tendency to miss a period at random. I’m married almost 5 months now and the issue has just cropped up again – we tested for pregnancy twice as per our Rav’s advice and got 2 negative results. As it is, I have long cycles (since my wedding it has been 43 days between periods) and now I have no idea when to expect the next one, having never paid attention before. Is this a common issue? Is there any way for me to know when to expect my next period? It makes me nervous not knowing because I don’t want to be with my husband only to find blood on either of us afterwards…

Thank you for this website and your advice.


Mazal tov on your recent wedding!

Based on what you write, your cycle is in the general range of forty-three days. In that case, you do have a rule of thumb of when to expect your period. Halachically, you should observe vesatot only on your interval day, unless or until your cycles shorten to thirty days or less.

If you are worried about the possibility of discovering bleeding at the time of relations, you are permitted (not required) to check first. You can wipe externally with toilet paper — not after urinating, or waiting at least a few seconds (ideally, about fifteen seconds) after urinating. If you don’t find staining, you can go ahead with relations. If you do find staining on the paper, you are not niddah but we recommend abstaining until about a day after it subsides, so you can clarify whether it seems like you are getting a period.

You may also find it helpful to explore fertility awareness. We discuss some of its principles here on our site regarding contraception, but it can also help with conception, and with being more aware of one’s body.

Although longer cycles are fairly common, cycles of this length should be checked out with a gynecologist. A gynecologist can employ a range of tools such as a detailed medical history, ultrasound, internal exam, and blood tests to get an initial sense of why your cycles are long. In the meanwhile, if you can optimize your diet and lifestyle for healthier eating and more exercise, these steps can also affect cycle regularity.

We hope this helps. Please write back with any further questions.

This response has been updated to reflect the rulings of our current Rabbinic Supervisor, Rav Kenneth Auman, regarding waiting before wiping.

This internet service does not preclude, override or replace the psak of any rabbinical authority. It is the responsibility of the questioner to inform us of any previous consultation or ruling. As even slight variation in circumstances may have Halachic consequences, views expressed concerning one case may not be applied to other, seemingly similar cases. All health and health-related information contained within Nishmat's Women's Health & Halacha Web site is intended to be general in nature and should not be used as a substitute for consulting with your health care professional. The advice is intended to offer a basis for individuals to discuss their medical condition with their health care provider but not individual advice. Although every effort is made to ensure that the material within Nishmat's Women's Health & Halacha Web site is accurate and timely, it is provided for the convenience of the Web site user but should not be considered official. Advice for actual medical practice should be obtained from a licensed health care professional.

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