Cerebral infarction does not necessarily have sequelae. For patients with mild cerebral infarction, most of them can be cured clinically without sequelae if they can be treated positively and correctly. For patients with severe cerebral infarction, the signs and symptoms of neurological deficits are often more severe, and some patients may have certain sequelae. Severe cerebral infarction refers to patients with large cerebral infarction or brainstem infarction, and the clinical symptoms and signs of such patients are often more serious, and the patients may show abnormalities of body movement and sensation, and speech dysfunction may occur. Patients with cerebellar brainstem infarction can have dizziness, nausea, vomiting, dysarthria, ataxia, balance disorders, and in severe cases, they can have consciousness disorders, which can cause cerebral edema and increase intracranial pressure, and even lead to death. If the patient is left with signs and symptoms of neurological deficits after one year of active treatment, it is generally referred to as the sequelae stage, and patients who enter the sequelae stage often have poorer treatment outcomes.