1.Vertigo: It is mild and lasts for more than 2-3 weeks, or up to weeks, months or years. It is rotational in nature or a sense of movement to one side, independent of the change of head position or body position. 2. Nystagmus: It can persist, not consistent with the degree of vertigo, as coarse nystagmus, mostly horizontal, rotational oblique and vertical. 3.Balance disturbance: unstable standing and indefinite direction of side fall, not related to nystagmus and head position. 4.Vestibular function test: normal response to hot and cold water test. 5.Auditory symptoms: Tinnitus and hearing loss are absent or insignificant, but auditory neuroma may have progressively aggravated tinnitus and deafness, and vertigo with internal auditory artery occlusion may be accompanied by mild tinnitus and deafness. Autonomic symptoms: nausea, vomiting and sweating are not obvious, and vertigo may be accompanied by vomiting when intracranial pressure is increased. 6.Signs of central nervous system: There may be signs of impaired brainstem, cerebellum and temporal and parietal lobes of the brain. 7.Central vertigo: including vascular origin, tumor, brainstem or cerebellar infection, and multiple sclerosis of cerebellum and brainstem, malformation of craniocervical junction area, drug origin, migraine vertigo, epileptic vertigo, cervical vertigo, post-traumatic vertigo.