I. The situation before the vertigo attack Whether there is cranial trauma, excessive smoking and drinking, mental and emotional instability, exertion and insomnia before the attack, whether it is dizziness or vertigo. Is the attack of vertigo at night or in the morning? First attack or repeated attacks? 2. Under what circumstances? Is it related to the change of body position, turning over in bed, getting up, or turning the neck? 3. Is the form of vertigo rotational or non-rotational? 4. Is the intensity tolerable? Is the consciousness clear? 5. Does the vertigo decrease or increase when opening or closing the eyes? Does vertigo worsen when there is a change of position or sound or light stimulation? The following symptoms occur before, during or after vertigo. 1. Autonomic symptoms, nausea and vomiting, pale face, rapid or slow pulse rate. Increased or decreased blood pressure. Diarrhea. 2.Ear symptoms Whether there is deafness, tinnitus, ear stuffiness before the onset, or whether the existing cochlear symptoms are aggravated. 3.Eye symptoms Darkness in front of the eyes, double vision, blurred vision. 4.Neck symptoms Whether there is pain in the neck or shoulder and arm, numbness of the upper limbs, limited movement. 5. Central nervous symptoms such as headache, impaired consciousness, loss of perception, convulsions, balance disorders, sensory and motor disorders, with special attention to the presence of facial numbness, speech and dysarthria, swallowing difficulties and other brainstem and cerebellar symptoms. Past history Occupation, lifestyle, smoking and drinking habits, history of ear disease, surgery, medication, traumatic brain injury, motion sickness, etc.