Coughing up foamy mucus sputum is one of the symptoms of chronic bronchitis, which is a chronic non-specific inflammation of the tracheobronchial mucosa and its surrounding tissues caused by infectious or non-infectious factors. Its pathology is characterized by hyperplasia of bronchial mucus glands and increased mucus secretion. Infection is one of the most important factors in the development of chronic bronchitis. Viral mycoplasma and bacterial infections are the main causes of acute attacks of the disease. Viral infections are common with influenza virus rhinovirus adenovirus and respiratory syncytial virus, bacterial infections are common with Streptococcus pneumoniae Haemophilus influenzae Catarrhella and Staphylococcus, bacterial infections occur every time secondary to viral or mycoplasma infections on the basis of damaged airway mucosa. . The prevention of coughing foamy mucus sputum: 1, quit smoking Chronic bronchitis patients should not only quit smoking in the first place, but also avoid passive smoking. The chemical substances in the cigarette such as tar, nicotine, cyanuric acid, etc., can act on the plant nerves and cause spasm of the bronchial tubes, thus increasing the resistance of the respiratory tract; in addition, it can also damage the epithelial cells of the bronchial mucosa and its cilia, which increases the secretion of the bronchial mucosa and reduces the purification function of the lungs, easily causing the reproduction of pathogenic bacteria in the lungs and bronchial tubes, thus leading to the occurrence of chronic bronchitis. The actual fact is that you can find a lot of people who are not able to get a good deal on a lot of things. This is because the cold can reduce the defense function of the bronchial tubes on the one hand, on the other hand, it can reflexively cause the contraction of the smooth muscle of the bronchial tubes, the obstruction of the blood circulation of the mucous membrane and the discharge of secretions, and secondary infections can occur. 3, strengthen exercise chronic bronchitis patients in remission to make appropriate physical exercise, in order to improve the body’s immune system and heart and lung storage capacity. 4, prevention of colds Pay attention to personal protection to prevent the occurrence of colds. Those who have the conditions can do cold exercise to prevent colds. 5.Environmental protection Pay attention to improve environmental health and personal protection. Eliminate and avoid the influence of smoke, dust and irritant gas on the respiratory tract to avoid inducing chronic bronchitis. Remove primary lesions such as chronic sinusitis and tonsillitis. Pay attention to the timely and effective thorough treatment of acute bronchitis, which is of positive significance for the prevention of chronic bronchitis.