Ankylosing spondylitis does not usually cause cervical instability. Ankylosing spondylitis belongs to rheumatoid immune disease, which is a chronic inflammatory disease. The cause of the disease is still unclear, and it may be related to genetics, immunity, infection and other factors. Early symptoms of back pain may occur, and as the disease progresses, it may develop from the lumbar spine to the cervical spine, thoracic spine and other parts of the spine, but generally does not cause cervical spine instability, but may lead to cervical spine pain or spinal deformity. It is recommended that patients with ankylosing spondylitis develop good daily habits, correct bad standing and sitting postures, and at the same time carry out reasonable exercise to avoid over-exercise, which may aggravate the condition. If cervical pain or spinal deformation occurs, it is recommended to go to the rheumatology and immunology department of regular hospitals. It is recommended that patients with cervical spine instability should consult the hospital in time and have appropriate diagnosis and treatment under the guidance of the doctor.