Moisture is the product of poor metabolism of water in the body, the source of moisture has external moisture and internal moisture, the main difference is: a. External moisture, because long lived in the wetlands, such as living in water towns, fishermen along the coast, the environment is humid or rain and water, external moisture into the dip. Air conditioning in summer, heating in winter, indoor and outdoor temperature difference, the skin surface sweat can not be pronounced as usual, wet depressed muscle surface and then into the body. Second, internal humidity, and spleen deficiency is closely related to the spleen and stomach injury due to cold drinking cold, the spleen does not transport, gather and become wet, cold damp dip spleen, eat spicy, greasy food and alcohol abuse leads to stomach can not rot, digestion, the spleen can not transport, metabolic waste can not be excreted, resulting in wet long into heat. Excessive exertion and depletion of qi leads to qi deficiency, the body does not metabolize waste and the formation of dampness, less activity, the metabolic rate slows down, dampness is generated internally.