The effects of yam are to nourish the spleen and stomach, promote the production of body fluid and lungs, tonify the kidney and astringent essence, benefit the qi and nourish the yin, and stop diarrhea. It is often used as a tonic for qi and yin. Since yam belongs to the lung, spleen and kidney meridians, and is rich in mucus substances. Relative to the spleen meridian, yam is used to treat the symptoms of spleen deficiency, such as low food intake, prolonged leakage and excessive leucorrhea; relative to the lung meridian, it is used to treat lung deficiency, asthma and cough, and prolonged cough; relative to the kidney meridian, it is used to treat spermatorrhea, leucorrhea and urinary frequency. It is also used in treating thirst and deficiency of qi and yin. Commonly used in the decoction of 15-30g into the medicine, fried to enhance the role of yam spleen tonic diarrhea. However, it is important to note that because of its ability to dispel dampness, yam should not be used for people with dampness (too much dampness leading to fullness and discomfort in the spleen and stomach) or with stagnation. Yam should be used under the supervision of a Chinese medicine practitioner. Avoid adverse reactions.