The incidence of lung cancer has shown signs of significant increase in most countries, and in recent years, lung cancer has taken the first place in the incidence of malignant tumors in many large cities in China. Lung cancer is a cancer originating from bronchus and lung, because most of them originate from bronchial mucous membrane epithelium at all levels, and less from bronchial glands or alveolar epithelial cells, thus lung cancer is essentially a bronchogenic cancer. According to the classification of anatomical site, it can be divided into central type lung cancer and peripheral type lung cancer. According to the histological classification, lung cancer can be divided into two major categories, including small cell lung cancer and non-small cell lung cancer, which in turn includes squamous, adenocarcinoma, large cell carcinoma and adenosquamous carcinoma. Most lung cancer patients already have symptoms at the time of consultation, and only 5% of patients have no symptoms. The common symptoms of lung cancer patients include cough and hemoptysis. Tumors that cause obstruction of the airways can cause different degrees of obstruction symptoms, such as wheezing, chest tightness, shortness of breath, chest pain and fever. The tumor can cause distant metastasis, including enlarged supraclavicular and cervical lymph nodes, and the enlarged lymph nodes can be palpated at this time.