There are many people who are confused, is a brain infarction life threatening? Why are some people not at risk when they have a brain infarction? In fact, cerebral infarction has life-threatening risks, such as large cerebral infarction, brainstem infarction, multifocal infarction, and cerebral infarction in which the infarction factors continue to exist and can cause new infarction foci to occur, all of these cerebral infarction may endanger life safety. Secondly, some cerebral infarcts are not life-threatening because the infarct factors are no longer present, the infarct foci are smaller, there are fewer infarct foci, and important neural clusters are not severely damaged. The severity of risk factors in cerebral infarction is different in different periods, and the acute phase is relatively more dangerous, which shows that the infarct foci continue to expand, the edema foci of infarction continue to increase and are not easy to control, the loss of neurological function continues and increases, and in severe cases, it can cause central respiratory and cardiac arrest, so cerebral infarction has high mortality and disability rates. The recovery period is relatively less dangerous, with gradual recovery of neurological function. However, patients with cerebral infarction can have new infarct lesions, new infarct symptoms and neurological deficits in any period, leading to aggravation of the disease. Therefore, elimination of various infarct-causing factors is the key to treatment, and preventive treatment for the reoccurrence of cerebral infarction should be done. The acute phase can also be divided into the acute exacerbation phase, which is generally from two to five days, when the condition will gradually worsen, and the acute stabilization phase, which is generally from the fifth to the tenth day after the onset of the disease, when the condition is in a state with no significant changes in symptoms.