There is no direct clinical association between white foamy sputum and lung cancer. White foamy sputum is usually seen in bronchitis, viral cold, pneumonia and other diseases, and is not common in lung cancer. Common symptoms of lung cancer include paroxysmal dry cough, blood in sputum, chest tightness and chest pain. Lung cancer is a kind of malignant tumor, which can be caused by smoking, heredity, air pollution and other factors. The main symptoms can be seen as paroxysmal dry cough, blood in sputum, hemoptysis, chest pain, etc. The specific manifestation of the symptoms can be different in different parts of tumor growth. White foamy sputum can be seen in bronchitis, pneumonia, viral cold and other diseases, and is not common in lung cancer. If you have white foamy sputum, you should go to the hospital in time and undergo the relevant examination in order to clarify the cause of the disease and actively cooperate with the doctor’s treatment.