Early stage of lung cancer may have no obvious symptoms and may not necessarily cough, but as patient’s condition aggravates, lung cancer patients will not only have coughing manifestation, but also chest pain, coughing up phlegm and other symptoms. Generally lung cancer will not show obvious symptoms in early stage and most patients will find it in chest imaging or physical examination, so lung cancer patients may not necessarily have coughing symptoms. However, as the condition of lung cancer develops, some patients may have paroxysmal irritating dry cough, and it will be accompanied by chest pain, coughing up sputum, hemoptysis, shortness of breath, fever, blood in sputum, hoarseness, purulent sputum and other manifestations. It is recommended that people who smoke frequently and are exposed to air pollution for a long time should have regular medical checkups, which can detect early lung cancer in time. After diagnosis of lung cancer, it is necessary to seek medical treatment in time and actively treat it. Usually, people should avoid smoking and reduce the chance of passive smoking, and eat nutritious food such as milk, eggs and apples.