Dried yam can be used to soak water to drink, but soak water to take which the active ingredients precipitation is limited, the effect is limited, it is recommended that with other Chinese medicines to form formulas, with the use of in order to increase the efficacy. As a medicine and food drug, yam has the effect of benefiting qi and nourishing yin (tonifying qi, nourishing yin), tonifying the spleen, lungs and kidneys (tonifying the lungs, spleens and kidneys), and fixing essence and stopping leucorrhea (fixing the fluid to stop leucorrhea). It can be used for treating spleen deficiency (weak spleen and stomach), tiredness (fatigue), loose stools (thin and unformed feces), diarrhea, lung deficiency (weak lungs leading to wheezing and coughing), and internal heat and thirst (internal heat accompanied by symptoms such as overeating, excessive drinking, and excessive urination). It is also contraindicated in those who are full of dampness (too much dampness causing fullness and discomfort in the spleen and stomach) or those who have solid evils or stagnation. Yam is evil to sweetness. Combining with alkaline medicines such as cuttlebone, dragon bone, oyster and corrugated seed reduces the efficacy. If you have any related symptoms, it is recommended that you consult a doctor in time, and do not use medication on your own to avoid adverse reactions.