Symptoms of atlantoaxial subluxation are mainly manifested in the cervico-occipital region, cerebrovascular nerves, five senses, and the whole body, etc. The details are as follows: 1) cervico-occipital region: mainly pain in the neck, limitation of movement, spasm and stiffness of the neck muscles, as well as protective postures in the head and neck, such as tilting of the head and neck forward, etc.; 2) cerebrovascular nerves: it can be manifested as headache, nausea, vomiting, vertigo, memory loss, and abnormalities of blood pressure. Abnormalities; 3, the five senses: can be manifested as fatigue of vision, nasal congestion, nasal allergy, eye distension, tinnitus, auditory disorders, etc.; 4, the whole body: mainly manifested as weakness, drowsiness, fatigue of limbs, but also can be manifested as instability of gait, or even sudden fall.