There are two main causes of dampness: first, internal causes. The internal cause is mainly spleen deficiency, which is considered by Chinese medicine to be the master of transportation and transformation, capable of transporting water and fluids, and various causes of spleen deficiency, where the transportation and transformation function of the spleen is malfunctioning and water and fluids cannot be metabolized normally, will remain in the body and form dampness, thus forming the symptoms of spleen deficiency and dampness obstruction. Clinical manifestations may include weakness, shortness of breath, heavy limbs, drowsiness, sleepiness, drowsiness, and sticky stools. Second, external causes, external causes are mainly the humidity of the external environment or the humidity of the living environment, such as the south of China or long-term living in the basement and other humid environment. Humidity in the external environment will have moisture invasion of the body, the formation of dampness. Dampness invades the body more, more serious, the spleen’s transport function can not properly metabolize dampness, resulting in dampness trapped in the spleen, heavy limbs, head stuffiness, head heavy as a wrap, body aches and pains and other symptoms.