Yam has the effects of generating fluids and benefiting the lungs, tonifying the kidneys and astringent essence, and nourishing the spleen and stomach. Yam is the rhizome of Dioscorea opposita, which is dried and used as medicine. Yam is sweet and flat in nature, and can enter the lung, spleen and kidney meridians. It has the effects of promoting the production of body fluid, tonifying the lungs, tonifying the kidney and astringent essence, and tonifying the spleen and nourishing the stomach. It is commonly used in clinical conditions such as deficiency of the spleen with little food, lung deficiency with wheezing and coughing, deficiency of heat and thirst, prolonged diarrhea, frequent urination, and dysuria. Among them, fried yam is good for spleen and stomach, suitable for excessive leucorrhea, diarrhea and loose stools (thin and unshaped feces), and spleen deficiency with low food intake. Yam is a medicinal herb with the same origin as food, and is mainly taken internally in decoction when used as medicine. The adverse effects of yam are not known, and it is contraindicated for those who are allergic to yam. Yam should be used under the guidance of a Chinese medicine practitioner, and should not be used blindly on its own in order to avoid any misunderstanding of the condition.