Lung Yin deficiency can lead to cough. Cough caused by lung yin deficiency is mainly manifested as dry cough without sputum or sputum is small and sticky, or sputum with blood, accompanied by zygomatic red (cheeks and zygomatic bones are red in color), five heart heat (the heart of the two hands and the heart of the two feet are hot, and consciously feel that the heart and chest are irritated and hot (irritation and sultriness)), night sweating (sweating abnormally after falling asleep, and waking up sweating stops), and so on. Lung yin deficiency is mostly caused by prolonged coughing that depletes lung yin, or injuries caused by labor, or exogenous dryness, resulting in deficiency of lung yin and fever arising from internal heat. Lung yin deficiency, loss of clear moisturizing, gas reversal in the upper, so cough and sputum; cough injury to the lung, so the sputum with blood; yin deficiency and fire (the body of yin essence loss, the emergence of excessive fire) will be the afternoon hot flashes, hands and feet, heart fever; tongue red with little moss, fine pulse, and so on. If symptoms of lung yin deficiency occur, consult a clinician and follow the doctor’s instructions for treatment.