Patients with cerebral infarction can be caused by blockage of different blood vessels, such as the middle cerebral artery, anterior cerebral artery, posterior cerebral artery, anterior communicating artery, posterior communicating artery, and the branch vessels of the large vessels mentioned above. In the case of large vessel blockage, patients with large infarct foci may experience impaired consciousness including drowsiness, lethargy, coma, decorticated state and vegetative state. If a posterior cerebral artery or posterior communicating artery is considered, called posterior circulation cerebral infarction, the patient may present with bulbar palsy and tetraplegia, which may also manifest as dizziness, nausea, vomiting, balance disturbance and ataxia. If there is a lesion in a small vessel, it is usually focal signs and symptoms, including sensory and motor deficits in one limb, dizziness, balance deficits, and deductive dysfunction.