The neck does not dare to tilt back, tilt back on the pain, the common reasons are the following: First, the strain of the neck muscles, due to long-term head down, bending activities, or long standing, sitting, improper posture caused by fatigue of the neck muscles, repeated fatigue will occur after the strain, causing spasm and adhesion of the neck muscles. When the neck is tilted back, it will pull these spastic muscles, or when tilted back, it will cause the adhesions to tear apart, which will cause pain. Second, cervical spondylosis, cervical spondylosis may appear in the cervical spine parts of the osteophytes, small joint synapses of the osteophytes, these osteophytes will produce irritating symptoms when the backward movement.