Cough is a common condition of the respiratory system. When visiting a doctor in the hospital, the doctor will ask the patient about the nature of the cough, for example: How long has the cough been going on? Is it a dry cough or is there sputum? What is the color and nature of the sputum? Is it heavy during the day or at night? What is the rest of the body? This is important for the doctor to make a diagnosis. In Chinese medicine, the treatment is based on the identification of symptoms, so look. Smell. Ask. Cutting. This is even more important for diagnosis. TCM considers the lung as a delicate organ, most susceptible to attack by external evil. If it is attacked by the six mirths of wind, cold, heat, humidity, dryness and fire, it will cause the lung to lose its propagation and lowering, and the lung qi will rebel, causing a cough. Chinese medicine classifies coughs into two categories: external and internal injuries, of which external coughs are mostly real and are related to the external influences of the six evil spirits. According to the nature of the evil, there are wind-cold, wind-heat, wind-dry, phlegm-damp and so on. Dry coughs with little phlegm are mostly dry or windy coughs, also known as “dry coughs”, while coughs with phlegm are also known as “damp coughs” and can be cold. There is also a distinction between cold and heat. Generally, thin and white phlegm belongs to the wind-cold attack on the lung, while sticky or yellow phlegm belongs to the wind-heat attack on the lung. Internal coughs are based on dysfunction of the organs, with phlegm-dampness, phlegm-heat, liver-fire offending the lungs, and lung-yin deficiency as the main symptoms. If the sputum is thick, sticky or lumpy, it is phlegm-dampness in the lung; if the heat is heavy, the sputum is sticky and yellow with a fishy smell. If the cough is continuous and the sputum is small and sticky or with blood, then it is liver fire offending the lung. If there is dry cough without phlegm, or if there is phlegm that cannot be easily coughed out, dry mouth, dry tongue, hot and sweaty heart, etc., then it is a deficiency of lung and kidney yin. Treatment is also different. In Chinese medicine, chronic cough is considered to belong to the category of “prolonged cough” and “prolonged cough”, which has a longer course and a more complicated etiology. The causes are related to “wind”, “phlegm”, “deficiency” and “silt”, of which wind is the first and this deficiency is the basis. It belongs to the category of internal cough.