月經,亦名天癸、信水、月水、月信,女子生理之事。諱云月事、例假。蓋女子卵熟未孕,子宫内膜月剝,與血自陰道出也。
凡女子,年當豆蔻,發身,將有經血出,可五六日,謂曰「初潮」。血出半月,卵復一熟。其後,每廿八日復之,或因人而少異。期月而發,故稱月經,有如潮信,亦稱「月經來潮」。
夫女子既生,卵有定數,每月一熟。盡不復生,天癸竭也。月經竭,名曰「絕經」,絕經即更年,不復妊矣。
天癸至,女子多焦慮。間伴疼痛,是為痛經。又信水不潔,故有衛生巾、棉、帶備之也。
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