Lung cancer is a great threat to human life and health, and it is usually at an advanced stage when diagnosed, with a low cure rate. Patients with advanced lung cancer usually do not have specific 15 symptoms before dying, but often show symptoms such as dyspnea, pain, organ failure, bleeding, etc. 1. Dyspnea: Patients with advanced lung cancer before dying may continue to secrete fluid from the trachea to form phlegm, resulting in blockage of the trachea, or cancer tumors expand to compress the airway, which may lead to symptoms such as dyspnea, cyanosis, hoarseness, and difficulty in speaking, and finally may develop It may develop into weakening, slowing down, stopping or even stopping breathing; 2. Pain: metastasis of cancer cells to many parts of the body may cause patients to have severe pain symptoms, including but not limited to chest pain, abdominal pain, headache, etc., which is a more common symptom before the end of lung cancer; 3. The involvement of other organs and tissues may cause the failure of other organs or even the whole body, or symptoms such as lethargy, unconsciousness and decreased heart rate; 4.Hemorrhage: if lung cancer tissues collapse or invade other blood vessels, it may cause symptoms such as vomiting blood and black stool. In addition, symptoms such as dilated pupils, mental confusion, confusion, gibberish, loss of physiological reflexes and decrease in blood pressure may also appear before the death. If these manifestations appear, it means that the patient is very weak and in the terminal stage of tumor. It is recommended that family members stay by the patient’s side throughout the whole process.