The causes of amnesia in advanced stage of cancer are related to edema of brain cells and brain metastasis of cancer cells. Radiotherapy and chemotherapy, reasonable nutrition, and strengthening accompanying care should be given as main treatment. 1. Radiotherapy and chemotherapy treatment: if cancer brain metastasis occurs and tumor cells infiltrate brain tissues, brain dysfunction can occur in the corresponding area, causing amnesia. Radiotherapy, chemotherapy, targeted drugs and immunotherapy can be used to kill tumor cells and reduce their infiltration, so as to improve the symptoms. Dehydration drugs can also be used to reduce brain cell edema. 2. Reasonable nutrition: when the cancer is advanced, reasonable nutrition should be given, such as proper intake of fresh vegetables and fruits, high quality protein, etc. If it is not possible to intake by mouth, nasal intake is needed. If oral intake is not possible, nasal feeding or intravenous nutrition is needed. 3. Strengthen nursing care: patients with advanced cancer have lost the ability of daily life, and should be accompanied to avoid intrapulmonary infections and bedsores. Memory loss in advanced stage of cancer should be treated reasonably under the guidance of doctors, and medicines need to be used under the guidance of doctors.