《黄帝内经·素问·水热穴论》
呈勇力而劳动太过，则汗出于肾；出汗时遇到风邪，风邪从开泄之腠理侵入，汗孔骤闭，汗出不尽，向内不能入于脏腑，向外也不得排泄于皮肤，于是逗留在玄府之中，皮肤之内，最后形成浮肿病。此病之本在于肾，病名叫 风水 。
勇而劳甚，则肾汗出，肾汗出逢于风，内不得入于脏腑，外不得越于皮肤，客于玄府，行于皮里，传为胕肿，本之于肾，名曰风水。
If a strong person works too hard, then sweat will flow out from kidneys. During the sweating, if the person is attacked by cold pathogens, then the cold pathogens will invade the skin and enter the body, which will block the sweat pores, making the sweat unable to be secreted. Then the sweat will be trapped between the skin and organs, which will cause edema. The root of this disease is in kidneys, which is named "wind and water".