Cancer is a collective name for a large group of malignant tumors, and generally at advanced stages there may be some types that deteriorate more rapidly, leading directly to death possibly in 3 months time or in some cases within 1 month with explosive and widespread spread of metastases. Usually the main cause of terminal cancer death is the failure of vital organs, such as liver failure, respiratory failure, and cardiac circulatory failure, etc., which can directly lead to death. Extensive metastasis of cancer will cause corresponding symptoms. Liver metastasis can lead to abdominal distention, ascites, abdominal pain, jaundice and other symptoms, which can gradually lead to liver failure and death, as well as completely affect the patient’s inability to eat and severe malnutrition. In addition, pulmonary metastasis will lead to hemoptysis, difficulty in breathing, etc., which will also directly lead to the patient’s death, but there is no way to determine how long it takes from deterioration to death, and it can only be seen while treatment.