Transient ischemic attack refers to the onset of symptoms of ischemia within a certain period of time and at the same time, it is quickly relieved, which was previously set at 24 hours, but is now defined as a quick recovery of symptoms of ischemia within an hour. Symptoms include many, one condition is the symptoms of common cerebral infarction, which manifests as inflexible movement of one limb or headache, dizziness, rotation of vision, which may appear as sudden hemiparesis of one limb, recovering by itself after half an hour, or inability to walk in the lower limb, recovering by itself after a period of time. Another condition is that transient ischemic attack is only posterior circulation ischemia, and this kind of condition may have sudden weakness of lower limbs when walking and fall, without obvious limb movement disorder, but only fall attack, which is also a symptom of transient ischemic attack. The symptoms of transient ischemic attack are the same as those of cerebral infarction, but the difference is that the symptoms of transient ischemic attack can be recovered quickly within an hour.