Dizziness, weakness of limbs and feeling very floating is a balance disorder, mostly considered to be caused by posterior circulation cerebrovascular disease, such as posterior circulation transient cerebral ischemia can occur in patients, the general duration of symptoms varies from several minutes to tens of minutes, rarely more than an hour, and the symptoms are completely relieved within 24 hours, mostly seen in middle-aged and elderly people, may be a manifestation of cerebral atherosclerosis, can be applied to activate blood circulation It may be a manifestation of cerebral atherosclerosis, and can be treated with drugs that activate blood circulation and improve blood circulation. If frequent attacks develop into cerebral infarction, anti-platelet aggregation drugs should be applied. If the patient’s symptoms are persistent, it may be cerebellar or brainstem infarction or hemorrhage, or cerebellar tumor and inflammation. Cerebrovascular disease usually has an acute onset, and brain tumors usually have a chronic onset, and cranial MRI can clarify the diagnosis. Patients with subacute onset of encephalitis may present with fever. If necessary, an electroencephalogram or cerebrospinal fluid extraction for pathogenic examination may be performed to clarify the diagnosis.