There is no specific data on the survival time of patients with advanced cancer with symptoms of lethargy after treatment, which may be a few days or a few months and can vary. Cancer is a malignant disease caused by heredity, gene mutation, environment and other factors, and multiple metastases can occur as the disease progresses to the advanced stage. There are many reasons for patients to have drowsiness in this period, which may be brain metastasis, corresponding malignant tumor encephalopathy, such as hepatic encephalopathy, or malnutrition, etc. The aim of treatment in this period is to prolong the life of patients. The aim of treatment in this period is to prolong the survival period and improve the quality of life. After active treatment with radiotherapy, targeted therapy, immunotherapy, symptomatic therapy, etc., the specific survival time can be only a few days or a few months, and if the degree of tolerance to the treatment is high, the survival period can be slightly prolonged.