The effects and functions of yam boiling water are to benefit qi and nourish yin, tonify the spleen, lungs and kidneys. However, the effect of yam boiling water is limited and cannot replace medication. Yam belongs to the same source of medicine and food, clinically mainly used to treat spleen deficiency, less food, tiredness (fatigue), loose stools (feces thin not shaped), diarrhea, lung deficiency, asthma, kidney deficiency, spermatorrhea, frequent urination, internal heat and thirst (body heat with more food and more drinking and more urination and other symptoms). Dampness in the fullness (dampness is too heavy to cause fullness and discomfort in the spleen and stomach) or solid evil, accumulation and stagnation of people forbidden to take yam. It should be noted that if patients need to use yam boiling water, it is recommended to use it under the guidance of a doctor to avoid delays.