The symptoms of lung tumor are various, mainly divided into the following aspects. 1. clinical manifestations of respiratory system caused by tumor, mainly manifested as cough, coughing sputum, hemoptysis, chest pain, shortness of breath, wheezing, fever, etc. 2. symptoms caused by organ involvement or metastasis, such as laryngeal recurrent nerve involvement, which can lead to hoarseness of voice. Pleural involvement can lead to pleural effusion, which can cause shortness of breath. If the pericardium is involved, the pericardium may become engorged and the patient may experience severe dyspnea. In case of metastasis to abdominal organs, such as liver metastasis, pain in the liver area, decreased diet, abdominal distention, and abdominal pain can occur. When pancreatic metastases are present, jaundice and abdominal pain can occur. Patients may also develop metastasis to the central nervous system, for example, brain metastasis may manifest as headache, nausea, vomiting, psychiatric symptoms and general weakness. In case of bone metastasis, patients may experience pain in the area of bone metastasis, etc.