Phlegm is an acute and chronic tracheal – bronchitis, cough, phlegm, wheezing and inflammation are common main signs of lower respiratory tract infections. In the human respiratory tract, many small cilia wheat-like in the direction of the oral cavity slowly push out the dirty stuff, and when they push to the throat, the person coughs and spits. Acute tracheobronchitis, at the beginning of the disease is a single dry cough or cough up a small amount of mucus sputum, later with the development of the disease, coughing increased, secretions gradually increased, sputum is mucopurulent. According to Chinese medicine, the production of phlegm is mainly related to the lungs and spleen. The lungs are the main respiratory organs, regulating the flow of Qi (vital energy) in and out, as well as its rise and fall. If the lungs are not purified, coughing, wheezing and restlessness can occur. When wind or cold invades the lungs, it causes the fluid in the lungs to coalesce into phlegm. The spleen is responsible for transportation, i.e. digestion and transportation of nutrients to the organs. If dampness invades the body, or if excessive thinking, fatigue and poor diet can injure the spleen and cause it to lose its function of transportation and digestion, causing water and dampness to stop and condense into phlegm. After a few days of high fever caused by the heat evil invading the lung or the wind or cold evil, the fluid burns and transforms into yellow sticky phlegm, which is called hot phlegm. Acute tracheobronchitis, according to traditional Chinese medicine, is mainly caused by wind, cold, heat, humidity, dryness, and fire, resulting in the failure of the lung qi to be declared and the deregulation of suction and descent, which affects the entry and exit of the lung qi, thus causing coughing, coughing, and asthma. Depending on the quality of the body and the external evil, different symptoms such as wind-cold and wind-heat may occur. Other symptoms, such as inhalation of smoke and dust, can also cause cough. If the evil of lung health cannot be cleared in time, it can be transformed, such as wind-cold cough can become heat, wind-heat cough can become dry and injure fluid, so clinically there are different evidence of wind-cold, wind-heat, dry-heat and other coughs. Modern medicine believes that when the body’s resistance is low, such as cold, excessive fatigue, malnutrition, etc., so that the whole body or local defense function is low by infection (common respiratory syncytial virus, parainfluenza virus, influenza virus and adenovirus, Mycoplasma pneumoniae, etc., or secondary bacteria such as pneumonia bicoccus, Haemophilus influenzae, streptococcus and staphylococcal infection), physical and chemical stimuli (such as excessive cold air, atmospheric pollution, dust, irritating gases or staphylococcal infection). (such as excessive cold air, atmospheric pollution, dust, irritant gas or smoke inhalation) and allergic reactions (such as pollen, organic dust, fungal spores and other inhalation or allergy to seedling proteins) cause local defense function of trachea-bronchus to be weakened (mucosal epithelial damage, cilia movement disorders), resulting in inflammatory pathological changes such as mucosal congestion, edema, exudation and increased secretions.