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

  • Hebrew
  • English
  • Espnaol
  • Francais
  • donate

Premenstrual stains

17 August, 2004


Thank you for this wonderful service you provide!
More than a week before I expected to menstruate, I noticed a red stain on my underwear. Since I was wearing colored, I ignored it. This was on Shabbat, or possibly on Motzai Shabbat, I don't remember. On Sunday the same thing happened, but the stain was larger. Sunday night I stained again (on colored) & became suspicious that this could be my period, arriving early. I told my husband that I wasn't sure of my status & as a precaution we did not have relations. Monday morning I realized that I was beginning to stain heavily & that my period had begun. A few questions: Which day should I consider as my first niddah day for the purpose of making a "hefsek tahara" ? And from which point should I calculate my "onot prisha"?
Is there a rule of thumb you can share with me for this type of situation?


The five day minimum is calculated from the time you declared yourself niddah – in this case it is the Hebrew day that started with sundown Sunday night. The onot perishah are calculated from the onset of flow – in this case Monday morning. (If you have consistent staining prior to getting your period the rules may be different. However, you indicated that this was an unusual situation for you.)

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.

For further questions or comments: 

The Nishmat Women's Health and Halacha Site is a public service of Nishmat, The Jeanie Schottenstein Center for Advanced Torah Study for Women. This project and others like it are made possible by contributions from people like you. If you have benefited from the service, and wish to enable us to help others, click here to donate.

Users of Internet filtering services: This site discusses sensitive subjects that some services filter without visual indication. A page that appears 100% complete might actually be missing critical Jewish-law or medical information. To ensure that you view the pages accurately, ask the filtering service to whitelist all pages under

Accessibility Toolbar