Early symptoms of lung cancer Cough: It is the most common symptom of lung cancer, and about two-thirds of patients have coughing symptoms. It may appear as mild dry cough or severe cough with high frequency or nocturnal cough. However, in patients with chronic long-term cough, once the nature of cough changes, or frequency or nocturnal cough occurs, we need to be alert to lung cancer. Chest pain: About 30% of lung cancer patients will have chest pain. If the malignant tumor is located near the pleura, it will produce irregular dull pain or hidden pain, and the pain will be aggravated when breathing or coughing. Fever: There are two kinds of fever caused by lung cancer, one is inflammatory fever caused by obstruction of bronchus by lung cancer mass or compression of lung cancer mass by the wall of lung cancer mass; the other is so-called “cancer fever”, which is caused by toxins produced by necrosis of lung cancer tumor and often appears after extensive metastasis in late stage. Bloody sputum and hemoptysis: Although the incidence of bloody sputum and hemoptysis is lower than that of cough, it is more important than cough in diagnosing lung cancer. The signs to be seen are intermittent recurrent small amount of bloody sputum, more blood than sputum, bright red color, sometimes persistent and not easy to control, and if the lung cancer erodes blood vessels, it may cause hemoptysis. Tightness and shortness of breath: the presence of tumor affects the normal lung function. It is easy to manifest as stuffiness and shortness of breath when exerting, which is progressively aggravated and accompanied by cyanosis, and this condition is most obvious in central lung cancer. Middle and late stage symptoms of lung cancer Hoarseness: When the tumor invades the left side of mediastinum, the laryngeal nerve is compressed and the voice will be hoarse, usually without other symptoms such as sore throat and upper respiratory infection. Hoarseness is the most common symptom of advanced lung cancer patients. Shortness of breath Pleural effusion: If the tumor blocks the lymph node reflux, the tissue fluid will form pericardial effusion or pleural effusion, which can lead to shortness of breath. Facial and neck edema: The tumor invades the right side of mediastinum and presses the superior vena cava, which makes it rise angrily due to poor reflux and eventually leads to facial and neck edema.