The 4 most dangerous signs of transient ischemia are not scientific. Transient ischemic attack, commonly known as “mini-stroke”, is a rapid onset of the disease, often without precursors, and the symptoms of the attack are as follows. Due to the sudden ischemia of the vertebral basilar artery in the brain, clinical symptoms include headache, nausea, dizziness, and falling. It is also accompanied by eye symptoms such as blurred vision, visual field defects, transient dark haze in one eye or both eyes, which may lead to visual impairment or even blindness if the condition worsens. Due to transient ischemia of the brain, brain cells will be damaged to a certain extent, so there will be transient memory loss, hearing impairment, difficulty in swallowing, and even lead to hemiplegia. If there is an inability to speak, facial paralysis or confusion, the condition has progressed to a more serious stage. Transient ischemic attacks are more rapid in onset but have a better prognosis. Once they occur, it is important to seek prompt medical attention and early and standardized treatment under the guidance of a doctor can improve the prognosis.