Atlantoaxial subluxation may be caused by trauma, degenerative changes, infections and other reasons. 1. Trauma: Violent blows to the head and neck, head force during exercise or head and face injuries on the ground can cause injuries to the neck muscles and ligaments and lead to atlantoaxial subluxation. 2. Degenerative changes: with the patient’s age or due to the patient’s long-term poor head posture work history or life history, the atlantoaxial joint and its collateral ligaments can appear degenerative changes, which can lead to atlantoaxial subluxation. 3. Infection: the venous plexus at the back of the pharynx and the venous plexus around the odontoid process establish the traffic branch, when the venous plexus at the back of the pharynx is congested with blood due to infection and other reasons, the atlantoaxial vertebrae can be decalcified and the ligaments can be loosened, which will lead to the occurrence of atlantoaxial subluxation. In addition, atlantoaxial subluxation can also be seen in other diseases, it is recommended that patients go to the hospital in a timely manner, follow the doctor’s instructions for treatment to avoid delay.