The causes of abnormal cervical curvature include the following: 1, acute cervical muscle sprain: due to muscle pain and spasm, the muscle pulls the bone, resulting in straightening the cervical curvature. 2, cervical and shoulder muscle fiber tissue inflammation: due to long-term poor sitting posture, cold and other reasons can cause cervical and shoulder muscle fiber tissue inflammation, so that the muscle spasms due to pain. Pain caused by inflammation of joint capsule, ligaments and small joints can also reflexively cause spasm of the neck muscles to protect the affected joints, so the spasm of the neck muscles can cause straightening of the cervical curvature. With the widespread use of computers, this condition is called the main cause of the vast majority of young people. 3, root type cervical spondylosis: In the acute stage, because the affected small joints are acutely inflamed, the joint periosteum and joint capsule are swollen, the adjacent nerve roots are irritated, the patient mostly has muscle tension in the neck and shoulder, and the activity is obviously restricted, which can cause straightening of the cervical curvature. 4, cervical spine lesions: such as cervical spine tumor, tuberculosis, septic infection, etc. can cause neck pain, muscle spasm, cervical spine activity restriction and physiological curvature straightening.