White phlegm is mainly caused by the following reasons: First, chronic bronchitis. Chronic cough, white foamy sputum, chest tightness, shortness of breath and other symptoms will appear when chronic bronchitis is in remission. The diagnosis was confirmed mainly by chest X-ray, lung CT, lung function, blood routine examination, etc. Second, chronic cardiac insufficiency. When the disease attacks, there will be cough and white sputum, and when the disease is serious, there will be pink foam sputum, accompanied by chest tightness, shortness of breath, dyspnea and other symptoms. The auxiliary diagnosis was mainly made by ECG, heart color ultrasound, blood BNP, etc. Third, when there is a foreign body in the bronchus, irritating cough, white sputum and other symptoms will appear. Improve chest radiography, lung CT and other examinations to assist diagnosis.
