Yam, a kind of Chinese medicine with the same origin of medicine and food, belongs to a kind of nourishing Chinese medicine. Yam will not produce phlegm when eaten, and it has the function of strengthening the spleen, tonifying the lungs and benefiting the kidneys. Generally speaking, yam is calm in nature and has a good therapeutic effect on spleen qi deficiency, lung qi deficiency and kidney qi deficiency. According to Chinese medicine, the generation of phlegm in the body is closely related to spleen and lung deficiencies. Therefore, yam can generally treat heavy phlegm-dampness in the body without generating phlegm. Generally speaking, Chinese herbs that produce phlegm are mainly those that are more nourishing and more difficult for the spleen and stomach to digest, which can easily lead to impaired digestion of the spleen and stomach. Of course, if you want to use yam to treat diseases, it is recommended to do so under the guidance of a Chinese medicine practitioner and not to use the medicine without authorization.