The main manifestation of cervical ankylosis is that the muscles of the neck are very stiff and it is impossible to bend the neck. Its main causes are divided into the following aspects: first, caused by meningitis, the more common ones are: bacterial meningitis; tuberculous meningitis; viral meningitis; cryptococcal meningitis. Second, other factors, including increased intracranial pressure, such as cerebral hemorrhage, subarachnoid hemorrhage, stimulation of the muscles of the neck. Third, tetanus, which is also a relatively common disease, mainly causes muscle tonicity in the neck and is also accompanied by symptoms such as clenching of teeth and difficulty in opening the mouth. It can also be caused by other diseases of the neck, such as cervical spondylosis, tuberculosis of the neck, trauma, congenital malformations, etc.