Chronic phlegm coughing is mainly seen in chronic diseases of the respiratory system, the common ones are as follows: 1. chronic pharyngitis, patients often have a long-term history of smoking or like to eat spicy, irritating food, appeal factors repeatedly stimulate the mucous membrane of the throat and cause chronic inflammation. 2. chronic bronchitis, the disease is mainly seen in the middle-aged and elderly groups, patients often have a long-term history of smoking or other harmful gas, dust exposure history, such as chemical, carpentry, cement workers, ceramic production and processing workers, etc., long-term inhalation of smoke, dust, these substances can be deposited in the lungs, repeatedly stimulate the alveoli and bronchi and cause chronic inflammation. 3. The patient often has a history of long-term smoking or exposure to other harmful gases and dust, such as chemical, carpentry, cement, ceramic production and processing workers, etc., long-term inhalation of smoke, dust, these substances can be deposited in the lungs, repeatedly stimulate the alveoli and bronchi and cause chronic inflammation. 3, bronchial dilatation, the patient has a history of whooping cough, bronchitis, pneumonia, tuberculosis, etc., incomplete repair of lung tissue leads to abnormal and persistent expansion of the bronchi, bronchial mucus gland hypersecretion produces a large amount of sputum, stimulating The patient coughs and expels the sputum through the throat.