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

  • Hebrew
  • English
  • Espnaol
  • Francais
  • donate

Irregular periods

25 October, 2004


Thanks so much for a very useful site!

I recently came off the pill.
Month 1 it took 44 days for my period to come. Month 2 it took 36 days, but was very light and all brown, no red blood. Now 18 days later I have a "real" (red) and heavy period again.

So my question is about onot… do you think month 2 was a real period (it did last 6 days continuously)? How do you calculate onot when periods are very irregular like this?


If you experienced continuous bleeding, although brown, you count the onot from the onset of bleeding. So your onot for next month would be based on your current period: the Hebrew date, the 30th day (onah beinonit) and an 18 day interval from your current period. In general, count from the most recent period. If you're not sure, feel free to get back to us.

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