The most common clinical manifestation of primary bronchopulmonary cancer in early stage is the respiratory manifestation caused by the primary foci in the lung, which is mainly manifested in the following aspects: First, cough, which can be dry cough without sputum or cough with sputum, sputum can be white mucous sputum, and yellow pus sputum when combined with infection, and brick-red sputum when combined with special infection. Secondly, some patients have coughing up blood as the first symptom, which can be coughing up blood with sputum or full of blood. Third, some patients have chest pain as the clinical manifestation, which is mostly caused by the invasion of lung lesions into the pleura, or the metastasis of lesions to the bone. Fourthly, some patients may present with dyspnea as the first symptom, which is seen in patients with central lung cancer and is caused by compression or obstruction of the lung lesion. Fifthly, some patients may have hoarseness and choking when drinking water due to nerve invasion.