Vomiting after atlantoaxial repositioning may be a normal condition in which the nerve damage has not yet recovered, or it may be caused by incomplete repositioning, for example. Atlantoaxial dislocation caused by trauma, congenital dysplasia, or infection may result in compression of the spinal cord, nerves, and vertebral basilar arteries, causing nausea, vomiting, and dizziness. If the damage to the spinal cord and nerves is not completely repaired after repositioning, the patient may continue to vomit. Vomiting and dizziness may also occur due to incomplete atlantoaxial joint repositioning, resulting in obstruction of the flow of fluid in the spinal canal, causing increased intracranial pressure. If vomiting occurs after atlantoaxial repositioning, and the symptoms persist, cannot be alleviated, or even worsen, it is necessary to go to the hospital in time for treatment to avoid causing more damage.