Sudden dizziness and unsteady walking may be caused by cerebellar brainstem infarction and hemorrhage, or by insufficient blood supply of vertebral basilar artery, which should be examined by craniocerebral CT and MRI to make a clear diagnosis. In patients with cerebellar brainstem hemorrhage, craniocerebral CT may show high-density foci; patients with infarction usually show low-density foci; in patients with insufficient blood supply of vertebral basilar artery, craniocerebral CT is usually normal, and craniocerebral nuclear magnetism may show ischemic foci. Patients can also have dysarthria, dysphagia, choking on drinking water, and patients can also have diplopia, nystagmus, etc. It mostly occurs in middle-aged and elderly people, and patients often have hypertension, diabetes mellitus, hyperlipidemia, hyperhomocysteinemia, etc. It can also be caused by hypertension, and the blood pressure is very low, and the blood pressure is very low. It can also be caused by high blood pressure. Patients with high blood pressure may experience dizziness and unsteady walking, and should have their blood pressure tested for a definitive diagnosis. In addition, it may also be seen in patients with fever and cold, and further temperature and blood tests should be performed to facilitate the next step of treatment.