Some cancer patients can experience the phenomenon of flashback before they die. Although the symptoms are apparently relieved, it is usually a harbinger of the aggravation of the disease, which usually lasts about 3-5 days or 1 week. The folk so-called light-return situation occurs in the late stage of cancer, which is manifested as pain relief, increased appetite, clearer consciousness, etc. The situation can be the failure of multiple organs of the patient’s whole body and malnutrition, while the malignant tumor also shrinks or atrophies for a short time due to malnutrition, and the local pressure symptoms are relieved, but it is not the improvement of the disease, rather it may be the sign of the imminent deterioration of the disease, and most of the patients can die in death within a short period of time. It is recommended that the patient’s family members should be prepared for the return of light, not to expect too much, and to comply with the patient’s request to keep him in a happy mood so that he can say goodbye to his family.