text: Anomalies in this phenomenon are addressed with Rabbi Zeira's stringency.
full_question: Anomalies in this phenomenon are addressed with Rabbi Zeira's stringency. This phenomenon is established by a veset, and a bedikah cloth is used to assess it in the ritual hefsek tahara. The states of zavah ktanah and zavah gedolah arise when this phenomenon occurs during the days of zivah instead of the days of niddah. A metzorah, a person in the state of zav, or someone undergoing this phenomenon can cause an object to become a midras, and those people must purify by immersing in a mikveh. Special huts are constructed to house people during it to prevent contamination with their uncleanness, and sexual intercourse is strictly forbidden during this monthly phenomenon. For 10 points, name this normal physiological process considered "impure" by many religions during which the uterine lining is shed.
first_sentence: Anomalies in this phenomenon are addressed with Rabbi Zeira's stringency.
raw_answer: menstruation [or being on your period; accept word forms and equivalent answers]