Symptoms of acute cerebral infarction are related to the location of the infarcted cerebral blood vessels. If the blood vessels in a certain region are obstructed, the corresponding regional functional deficits will occur. It can be manifested as anterior circulation ischemia, such as weakness of hands and feet, sensory loss, slurred speech, etc., and posterior circulation ischemia, such as dizziness, vomiting, choking on drinking water, etc., and it is necessary to remember the BE FAST mnemonic to recognize cerebral infarction. 1. Anterior circulation ischemia: refers to ischemic infarction in the internal carotid artery system, which can be manifested as weakness of hands and feet on one side, abnormal sensation on the other side, blindness on one side, inability to understand other people’s speech or expression, etc. The smaller the site of cerebral infarction is, the less severe the symptom is accordingly. 2. Posterior circulation ischemia: refers to ischemic infarction in vertebral-basilar artery system, patients may manifest symptoms such as dizziness, nausea, vomiting, unsteady walking, choking on drinking water, difficulty in swallowing, etc. Generally, minor cerebral infarction of this system will not show serious manifestations such as coma. 3. BE FAST mnemonic: B refers to “balance”, E refers to “eyes”, F refers to “face”, A refers to “arm”, S refers to “arm”. F refers to “face”, A refers to “arm”, S refers to “speech”, and T refers to “time”. If you have the corresponding symptoms and suspect acute cerebral infarction, you should go to a regular hospital as soon as possible.