Definition, a brief episode of vertigo induced by head movements or body postural changes, is one of the most common peripheral vestibular disorders and is an inner ear disorder. The history may be self-limiting. Classification, 50-70% are primary, also called idiopathic, with no obvious cause; 30-50% are secondary, often secondary to or complicated by pathological conditions such as vaginitis, vestibular neuritis, head trauma, migraine, episodes of Meniere’s disease, sudden deafness, ear and ear neurosurgery. Diagnostic criteria, 1. Transient episodes of vertigo induced by head movements or changes in body posture associated with the direction of gravitational action (the affected semicircular canal is aligned with the gravitational force). The vertigo is rotational or floating and may be accompanied by mild headache, fear, nausea and unsteadiness. 2. The Dix-Hallpike test induces characteristic nystagmus with vertigo, which is characterized by (1) short latency (usually 1~5 seconds); (2) limited duration (usually <30 seconds); (3) rotational groundward nystagmus induced when the affected ear is downward (posterior semicircular BPPV for fast phase upward, anterior semicircular BPPV for fast phase downward); (4) reverse nystagmus when sitting or standing position is resumed; (5) weakened response when repeatedly placed in the induced position (nystagmus has 3. Identify or exclude diseases following vertebrobasilar artery insufficiency (VBI), cervical spondylosis, posterior cranial fossa tumors, and other central nervous system disorders. Horizontal semicircular canal BPPV (variant), horizontal nystagmus induced to the ground or back when the affected ear is down, with greater intensity than in the non-lesioned ear. Subjective BPPV, with a history of the above mentioned disease, the Dix-Hallpike test does not induce significant nystagmus but is associated with vertigo symptoms, and canal stone repositioning treatment is effective. The efficacy of the treatment was evaluated from 2 weeks after treatment, and the disease status before and after 3 months of treatment was compared and graded. worsening.