Lung yin deficiency is characterized by dry cough with little phlegm, hot flashes and night sweats (abnormal sweating after sleeping, sweating stops after waking up), red cheekbones, hot hands and feet, and other symptoms. Lung yin deficiency is mostly due to dryness and heat injury to the lungs, or consumptive insects erode the lungs, or sweating injuries, or vegetarian tobacco, alcohol, spicy and hot products, or coughing and wheezing after a long period of time, old age and weakness, and gradually lead to the deficiency of lung yin (lack of yin fluid in the lungs) and become. Lung yin deficiency, loss of moisturizing, or deficiency fire burn lung, lung loss of purging, gas reversal in the upper, so dry cough without phlegm, or phlegm is small and sticky; even if the deficiency fire burns the lung liao, liao injury blood overflow, the phlegm with blood; yin deficiency and yang have no control, the deficiency of heat, so see the afternoon hot flashes, the five heart heat (two hearts and two feet of the heart heat, and conscious of the heart and chest heat (irritability and sultriness)), night sweating, two cheekbones red. In addition, there will be a red tongue with little moss and lack of fluids, and a fine pulse (the pulse becomes narrower and thinner and the rate increases), which is a sign of Yin deficiency and internal heat. If the above symptoms occur, it is necessary to go to a regular Chinese medicine hospital for diagnosis and standardized treatment as prescribed by the doctor.