1.What are the common symptoms of lung cancer? The main symptoms include paroxysmal irritating dry cough, no sputum or a small amount of white foamy sputum, hemoptysis, chest pain, chest tightness, shortness of breath and difficulty in breathing. There may also be fever, weight loss and other manifestations of neuromuscular disease, acanthosis nigricans, and hypertrophic osteoarthropathy. Some of them have no symptoms and are often found due to physical examination, and this group of people is increasing, thus the detection of early lung cancer is also increasing. 2.How to diagnose lung cancer? It is often divided into two parts: first, whether it is lung cancer, i.e. to find the basis, often through sputum cancer cell examination, bronchoscopy, CT localization puncture examination to further obtain direct pathological or cytological evidence; second, the severity of lung cancer, often through imaging examinations including chest X-ray, color ultrasound, CT, MRI, bone scan or pet-ct and other auxiliary diagnosis, which is simply divided into early, middle or late stage. 3.How to treat lung cancer? Surgery is currently the most effective means to treat early stage lung cancer. For lung cancer without distant metastasis and with completely resectable lesions, surgery-based comprehensive treatment is preferred as long as the patient’s physical condition permits. With the increase of medical examination, there are more and more early stage lung cancer, but still some patients are already in the middle and late stage when they are diagnosed and lose the chance of surgery, so they often need comprehensive treatment means, such as radiotherapy, chemotherapy or targeted therapy, etc. 4.What are the specific treatment methods for lung cancer? In general, lung cancer treatment includes surgery, chemotherapy, radiotherapy, targeted therapy, immunotherapy and Chinese medicine treatment. Among them, minimally invasive surgery is the most advanced treatment, which allows patients to recover faster and with less pain. Minimally invasive surgery for lung cancer has developed from small incisions to four-hole thoracoscopy, three-hole thoracoscopy, and the current single-hole and single-operated-hole thoracoscopy stage. The damage to patients has been greatly reduced. Next is targeted therapy, which can achieve better efficacy and less side effects by choosing appropriate targeted drugs according to different types of gene expression; the good news in chemotherapy is that the efficacy of drugs chosen according to different types of lung cancer has increased and the emergence of new drugs has made less side effects; in radiotherapy, due to the development of new radiotherapy machines and techniques, the efficacy and side effects of radiotherapy have also improved. 5.How to prevent and detect lung cancer at an early stage? The occurrence of lung cancer is the result of a combination of factors. It is clear that smoking is closely related to the occurrence of lung cancer, and quitting smoking can significantly reduce the chance of lung cancer. For those who are over 40 years old, are smoking or have a history of smoking or passive smoking, or have a family history of tumor, they should have a low-dose spiral CT examination to facilitate the early detection of lung cancer. Currently, there is a view that haze is also a factor in the increase of lung cancer, thus it is also important to take good protection in hazy days.