《黄帝内经·素问·评热病论》
胞脉属于心而下络于胞中，现水气上迫于肺，使心气不得下通，所以胞脉闭而月经不来。
胞脉者，属心而络于胞中。今气上迫肺，心气不得下通，故月事不来也。
The uterus connects to the heart and descends into the uterus. Now, water is pressing on the lungs, making the heart unable to descend, so the uterus closes, and menstruation stops.