Yin deficiency is due to an imbalance of yin and yang in the body. Yin is the fluid, essence and blood in the body that nourishes and moisturizes the body. Yin deficiency is a condition in which the body is deprived of moistening and nourishment due to a decrease in fluid, essence and blood in the body, and a condition in which deficiency heat occurs because Yin does not control Yang. The symptoms of Yin deficiency include dry eyes, dry mouth, dry skin, irritability, insomnia, sleeplessness, heat in the five hearts, and night sweating. Depending on the internal organs, the treatment differs. But the overall principle is to nourish Yin. Lung Yin deficiency is treated by nourishing Yin and moistening the lungs, stomach Yin deficiency is nourishing Yin and nourishing the stomach, heart Yin deficiency is nourishing Yin and calming the mind, and kidney Yin deficiency is nourishing Yin and nourishing the kidneys. People with kidney deficiency usually have to eat more kidney food, such as animal liver, sea cucumber, shrimp, black sesame, mulberry, wolfberry, etc. In addition, indiscriminate intercourse is often the main cause of kidney yin deficiency, in life we should pay attention to abstain from sex, do not eat warm and dry food like mango, durian, pepper, cinnamon, etc., also do not eat high-fat, high-calorie food, coffee, strong tea do not drink, life can slowly through dietary therapy regimen. In short, you need to be under the guidance of a doctor, do not indiscriminately supplement the aphrodisiac products, otherwise it will aggravate the symptoms of Yin deficiency, as long as you adhere to the treatment, the prognosis is generally very good.