Lung alveoli and lung cancer are two completely different diseases, with different causes, different symptoms, different severity and different treatment options. 1. Different causes: alveoli are mostly induced by congenital development, emphysema, chronic obstructive pulmonary disease (COPD), smoking, etc.; the causes of lung cancer are not so clear, and the common high-risk factors include smoking, ionizing radiation, heredity, history of lung disease, etc. 2. Symptoms: small-sized alveoli are asymptomatic and do not need to be treated; large-sized alveoli can compress lung tissues and affect lung function, resulting in chest tightness and shortness of breath; symptoms of lung cancer can include irritating cough, sputum, hemoptysis, chest pain, chest tightness, fever, hoarseness, difficulty in breathing and so on. 3. Different degrees of severity and treatment options: alveoli are benign changes, small alveoli do not need to be treated, huge alveoli can be resected by surgery; rupture of alveoli causes pneumothorax, which requires closed chest drainage and exhaustion to promote lung reexpansion; continued attack of lung cancer can cause respiratory failure, wasting and multi-organ failure, which requires pathological biopsy to be carried out and then choose anti-tumor treatments such as radiotherapy, chemotherapy, immunotherapy, anti-angiogenic treatment, etc. according to the type of pathology. Anti-tumor therapy such as chemotherapy, immunotherapy, anti-vascular therapy, etc. When discovering alveoli or lung cancer, it is recommended to seek medical treatment in time and treat the cause under the guidance of specialists.