The tendons at the back of the cervical spine may be caused by calcification of the collateral ligament, cervical small joint disorder, osteophytes, neck muscle strain, fasciitis and other factors. 1. Calcification of the collateral ligament: Most of the calcification of the collateral ligament is caused by chronic soft tissue strain due to daily habits and poor posture of the neck. Usually accompanied by cervical spondylosis and other conditions, often appear localized soreness, pain and so on. 2. Disorders of the cervical small joints: If the patient has disorders of the cervical small joints, it may also be accompanied by partial subluxation of the joints, which is mostly due to mild acute cervical sprain, which makes the synovial membrane of the joints embedded in the small joints, resulting in the interlocking or subluxation of the small joints. 3. Osteomalacia: degenerative changes of the cervical spine, poor posture of the neck, head and neck trauma can lead to osteomalacia of the neck. Degenerative changes of the cervical spine are mostly seen in the degeneration of the cervical spine with age; poor posture of the neck is usually caused by not paying attention to the correct use of the neck in daily life, insufficient exercise and lack of calcium intake. In addition, the tendons at the back of the cervical vertebrae may also be related to neck muscle strain, fasciitis and other factors. If this phenomenon persists and is accompanied by discomfort, it is recommended to go to the hospital for an X-ray examination to identify the cause of the problem and follow the doctor’s instructions to carry out targeted treatment.