Yam can benefit qi and nourish yin (replenish qi, nourish yin fluid), consolidate essence and stop the band, nourish the spleen, lungs and kidneys, and is often used to treat deficiency of the lungs, spleen and kidneys, and is prohibited to be taken by people who are full of dampness (too much dampness leads to fullness and discomfort in the spleen and stomach). Yam is the rhizome of Dioscoreaceae plant Dioscorea, which can benefit qi and nourish yin, consolidate essence and stop the band, tonifying the spleen, lungs and kidneys, and is often used in the treatment of deficiency of the spleen with little food, fatigue and weakness (tiredness and fatigue), loose stools (feces are not shaped) and diarrhea, as well as coughing and asthma in lungs, and spermatorrhea in kidneys. It should be noted that yam is not suitable for people who are full of dampness (too much dampness leading to fullness and discomfort in the spleen and stomach), or those who have accumulated solid evils. As a food with the same origin as medicine, the effect of using yam alone is limited. If you feel uncomfortable, it is recommended to use it with other Chinese medicines under the guidance of a Chinese medicine practitioner.