Symptoms of lung and kidney yin deficiency include dry cough, hoarseness, lumbago and leg weakness, and heat in the hands and feet, mostly caused by prolonged coughing and damaged lung yin, lung deficiency and kidney or kidney yin deficiency, kidney deficiency and lung. Lung and kidney yin deficiency refers to the deficiency of yin in the lungs and kidneys, with clinical manifestations such as cough with little sputum, blood in the sputum, dry mouth and throat, hoarseness, emaciation, lumbar and knee soreness, night sweating (sweating abnormally after going to sleep, but sweating stops after waking up), and so on. Lung and kidney yin deficiency is mostly due to long-term chronic cough, resulting in damage to lung yin, because lung and kidney yin and fluid nourish each other, lung fluid is used to nourish the kidney, kidney essence is nourished to nourish the lung, lung yin is damaged for a long time and then it injures kidney yin, or kidney yin is insufficient, and lung yin is injured by long-term illness, resulting in lung and kidney deficiency. The symptoms related to lung and kidney yin deficiency should be consulted in time, and individuals should not diagnose or use medication on their own in order to avoid causing adverse reactions and delaying the condition.