In late stage of brain tumor, this kind of death is mainly divided into two aspects: 1. the effect of occupying effect; then the occupying effect, in terms of mainly as the tumor keeps growing, it will compress the surrounding blood vessels and nerve tissues, especially compressing the blood vessels, such as the important blood vessels middle cerebral artery, anterior cerebral artery, basilar artery, etc., which will cause terminal ischemia and necrosis and form large infarcts, which is very dangerous. In addition, it will continuously invade the surrounding tissues, causing necrosis of nerve cells and producing a non-functional state, thus affecting the circulation of respiration and heartbeat. 2. Influence of chemical molecular factors. Some tumors may secrete some factors, and such cytokines are actually similar to a poison, which will cause abnormal reactions in human body at the end, and constantly consume the normal metabolic pathways of human body. Finally, people with brain tumors tend to be very thin, and then the functional cycles of all organs and organs of the body gradually decline, causing death.