There are many reasons for coughing white foamy sputum, clinically seen in respiratory diseases, such as chronic bronchitis, chronic pharyngitis; also seen in cardiovascular diseases, such as chronic heart failure. 1. Chronic bronchitis: chronic bronchitis can trigger bronchial mucosa cupular epithelial cell proliferation, resulting in local edema, congestion, and inflammatory exudate secretion, so there can be a cough, coughing white foamy sputum and other manifestations. 2. Chronic pharyngitis: due to chronic pharyngitis can lead to a large number of lymphoid follicles continue to proliferate, the formation of pharyngeal exudate and secretion, which is manifested in coughing white foamy sputum, accompanied by pharyngeal foreign body sensation and so on. 3. Chronic heart failure: chronic heart failure patients, there is usually pulmonary edema, so also cough white foamy sputum, accompanied by chest tightness, dyspnea, shortness of breath, cough and other manifestations. Coughing up white foamy sputum has many other causes, such as air pollution, chronic obstructive pulmonary disease, etc. If the symptoms persist for a long time, it is necessary to go to the hospital as soon as possible to clarify the cause of the disease, and follow the physician’s guidance to take targeted treatment.