Coughing white foamy sputum for years may be caused by chronic bronchitis, chronic pharyngitis, interstitial pneumonia and other diseases, which need to be judged according to the specific condition to determine whether it can be cured. 1. Chronic bronchitis: the etiology is still unclear, is the trachea, bronchial mucosa and its surrounding tissues of chronic non-specific inflammation, the main manifestation of chronic coughing, coughing up sputum, sputum is white mucus or plasma foamy. Chronic bronchitis generally can not be cured, but can be detected in time, standardized treatment does not affect life and learning. 2. Chronic pharyngitis: mainly refers to the mucous membrane of the pharynx is stimulated by inflammation, the patient will cough, cough white sputum, throat burning, dry and other symptoms. Chronic pharyngitis is generally difficult to achieve a radical cure, but can be controlled and relieved by paying attention to diet, oral care and effective treatment. 3. Interstitial pneumonia: mainly caused by inflammatory or fibrotic lesions in the interstitial tissues of the lungs, manifested as coughing sputum can be foamy. Few interstitial pneumonias can be cured, such as interstitial pneumonia caused by acute viral infections, which may be completely cured after active treatment. However, most interstitial pneumonias are not curable, and symptoms can be controlled through standardized treatment. Coughing white foamy sputum for many years can also be seen in other causes, it is recommended to consult the doctor in time, complete the examination, clarify the cause of the disease, and follow the doctor’s instructions for treatment, in order to obtain a good prognosis.