Posterior cervical curvature refers to the disappearance of the physiological curvature of the patient’s cervical spine and the phenomenon of reverse arch, which is caused by prolonged head bowing. The normal cervical spine has a physiological curvature, which is a forward convex arc, and this arc is clinically called the normal physiological curvature of the cervical spine. The normal cervical spine has a physiological curvature, which is a forward curvature, and this curvature is clinically called the normal cervical physiological curvature. The more you work at a desk or play with your cell phone or computer with your head down, the more time it takes to straighten the physiological curvature. When this straightening of the physiological curvature of the cervical spine is further aggravated, the phenomenon of reverse cervical physiological curvature, or posterior arch, will appear, accompanied by a series of clinical manifestations, such as neck pain, shoulder pain, dizziness, nausea and other symptoms. It can be corrected by special posture, and in daily life, attention is paid to avoid prolonged head bowing.