Syndrome of water vapor in Zhang Zhongjing's Treatise on Syndrome and Treatment of Water Vapor. "If blood is unfavorable, it is water" comes from Zhang Zhongjing's "Water-gas Disease in Syndrome and Treatment of Pulse Syndrome". The original sentence is: "women's menstruation is blocked by water, which is blood, and blood is unfavorable, which is called blood division." This sentence clearly points out that blood stasis can cause edema, the formation and development of water-wet phlegm and blood stasis, which is closely related to qi stagnation.