Nowadays, lung cancer has been derived as the number one cancer killer threatening human life, so how much do you know about lung cancer? The lung is located in the chest cavity and is an important organ of the respiratory tract, divided into the left lung and the right lung. Its function is to exhale oxygen and expel carbon dioxide to maintain the normal metabolism of the body. What is lung cancer? Lung cancer is a cancer formed by malignant transformation of bronchial epithelial cells or alveolar epithelial cells of lung tissue. The cancer cells further grow and expand to form a cancerous tumor, which can spread to the surrounding area or even the whole body. What are the causes of lung cancer? 1.Smoking 2.Atmospheric pollution: such as automobile exhaust and factory exhaust. 3.Living environment pollution: such as irritating decorative materials, oil smoke, carbon monoxide produced by incomplete burning coal. What are the common early symptoms of lung cancer? 1.Cough: multiple paroxysmal, irritating dry cough. 2.Hemoptysis: many sputum with blood or blood sputum. 3. Chest and back pain and chest tightness. What are the common examination methods to diagnose lung cancer? 1.Chest X-ray examination. 2.Sputum cancer cell examination: Note for sputum retention: after gargling on an empty stomach in the early morning, repeatedly cough lightly and then cough up deep sputum with force; sputum must be coughed out from the lung organs, saliva and nasal mucus cannot be mixed in for examination; sputum should be blood sputum, off-white sputum or transparent mucus sputum; 1-2 mouthfuls for each examination and three consecutive days for examination. 3.Fiber bronchoscopy: fasting and drinking for 4 hours before surgery to prevent intraoperative vomiting and accidental aspiration, and fasting and drinking for 2 hours after surgery. What should be noted in the diet of lung cancer patients? 1.Avoid eating high fat, moldy food, cured ham, smoked food and pesticide contaminated food. 2.It is advisable to eat “three high and one low” diet with high protein, high vitamin, high calorie and low fat, especially to eat more fresh vegetables and fruits. What are the common methods of lung cancer treatment? The treatment of lung cancer is multidisciplinary and comprehensive, and the commonly used methods include surgery, radiotherapy, chemotherapy, traditional Chinese medicine, immunotherapy, etc., among which surgery is the most important treatment method. Outlook The most ideal methods that can fundamentally reduce the incidence and mortality rate of lung cancer are: 1. to carry out comprehensive health education and implement a national smoking cessation campaign 2. to strengthen environmental pollution control, clean our air and living environment, and reduce the influence of environmental factors on the incidence of lung cancer 3.Strengthen the basic research of lung cancer etiology and molecular mechanism of lung cancer, clarify the exact mechanism of lung cancer genesis, and provide theoretical basis for lung cancer prevention 4.Research and elucidate individual susceptibility to lung cancer, and implement the strategy of combining group prevention and individual prevention. With the development of modern medical science and technology, the prevention and treatment of lung cancer in the 21st century will be more effective and achieve greater success.