Patients with brainstem infarction are unstable and prone to progression within a week, which is a more dangerous time for brainstem infarction. Some patients with severe brainstem infarction die within a few hours of onset. In patients with necrotic edema of brain tissue after cerebral infarction, edema generally peaks in 4-5 days, and brain tissue edema gradually decreases in 7-14 days, with liquefied brain tissue necrosis. Patients with cerebral infarction are mostly middle-aged and elderly, and their conditions are mostly combined with hypertension, diabetes, coronary heart disease and dyslipidemia, etc. The clinical manifestations and severity of the disease depend on the size and location of the lesions. If the lesion is large and the infarct is important, the danger period is prolonged; if the lesion is small and the infarct area is relatively unimportant, the patient may have no obvious danger period, the general symptoms are more stable and the recovery is relatively good, even no sequelae remain at all and work and life are not affected. In addition, since patients with cerebral infarction are mostly combined with risk factors such as hyperglycemia and diabetes, it is important to pay attention to the control of risk factors to reduce the progression and recurrence of cerebral infarction.