Atlantoaxial joint instability will cause its adjacent cervical nerve, vertebral artery, sympathetic nerve, etc. to be stimulated and compressed and a series of clinical symptoms will appear. Such as local symptoms, head symptoms, five senses symptoms, spinal cord symptoms, systemic symptoms and so on. 1. Local symptoms: such as neck stiffness, pain, restricted movement, etc. are common. 2. Head symptoms: impaired blood supply to the vertebrobasilar artery and irritation of the occipital nerve are the main symptoms, such as dizziness, headache, insomnia, depression, and abnormal blood pressure. 3. Symptoms of the five senses: such as visual fatigue, eye distension, diplopia, nasal congestion, tinnitus, hearing impairment, dry mouth and tongue. 4. Spinal cord symptoms: such as lower limb weakness, walking difficulties, limp legs, abnormal sensation in trunk, urinary and defecation disorders, and so on. 5. Systemic symptoms: such as body fatigue, fatigue of limbs, and so on. When atlantoaxial joint instability occurs, you should go to the hospital for further treatment.