2. Visceral function is weak. The first is the weakness of spleen and stomach function. Chinese medicine believes that spleen is the source of phlegm. When the function of the spleen and stomach declines, it will lead to the inability to metabolize water in the body and produce endogenous water. Secondly, when the lung function declines, there will also be water-dampness stagnation, because the lung is mainly responsible for declaring and dredging water channels. When lung function declines, the ability to dredge waterways declines. At this time, the water can not be excreted, which will cause the water to be wet.