The effects of yam include tonifying the spleen and nourishing the stomach, generating fluid and benefiting the lungs, tonifying the kidney and astringing the essence. It is used for spleen deficiency with little food, prolonged diarrhea, lung deficiency with asthma and cough, kidney deficiency with spermatorrhea, hypoglossia, leucorrhoea, frequent urination, deficiency heat and thirst. Tonifying the spleen and nourishing the stomach: As a commonly used medicine and food medicine, yam has a good effect of tonifying the spleen and appetizing the stomach (by strengthening the spleen to enhance appetite), and when ingested, it can regulate some discomforts such as distension and discomfort in the epigastrium (abdomen) caused by weakness of the spleen and stomach, poor appetite, indigestion, and diarrhea with loose stools (thin and unformed stools), and can strengthen the spleen and stomach and dissolve the stagnation of stagnant blood. Yam is also effective in tonifying the lungs and relieving coughs, which can help to alleviate prolonged coughs and dry coughs caused by deficiency of the lungs and kidneys. Nourishing the kidney and astringent essence: the main spermatorrhea, bring down, kidney deficiency urinary frequency and so on. The adverse effects of yam are not clear, and it is forbidden to take it if there is dampness in the middle (too much dampness causing fullness and discomfort in the spleen and stomach) or if there is solid evil or accumulation of stagnation. Patients who are not feeling well are advised to consult a doctor in time to avoid delaying their condition.