Yin deficiency is a state of human disease that does not cause fatal damage to the body, but seriously affects the quality of life of the patient. Yin deficiency can be subdivided into several different manifestations as follows: First, lung Yin deficiency. Lung yin deficiency mainly refers to a series of problems caused by deficiency of lung yin and internal production of deficiency heat. Commonly, there are dry mouth and tongue, thin body shape, low phlegm and sticky phlegm, etc. Most patients with lung yin deficiency are suffering from chronic damage to the lungs caused by prolonged coughing or fever, thus causing lung yin deficiency. Second, kidney yin deficiency. There are many causes of kidney yin deficiency, long-term medication, indiscriminate use of supplements, poor lifestyle can lead to kidney yin deficiency. Kidney Yin deficiency can lead to lack of blood, weakness in the limbs, heat in the hands and feet, serious kidney Yin deficiency patients will also lead to memory loss, spermatorrhea, impotence, premature ejaculation and other phenomena in men. Third, the stomach Yin deficiency. As the name implies, it mostly refers to the condition caused by insufficient stomach energy, which is usually caused by improper diet. Eating spicy and stimulating food can cause damage to the stomach, which leads to stomach yin deficiency. The main manifestations of stomach yin deficiency are, bloating and stomach pain, indigestion, lack of appetite, vomiting, dry stools, etc. Finally, there are many kinds of yin deficiency subdivided into various internal organs, mainly three as above, but no matter which yin deficiency constitution, it will lead to the body in a state of disease, resulting in reduced quality of life, so you need to take care of your body in time to avoid yin deficiency.