Straightening of the physiological curvature of the cervical spine may cause muscle pain, dizziness, headache, numbness of the limbs, nausea and vomiting, visual impairment and other symptoms. 1. Muscle pain: the muscles and ligaments of the back of the neck are involved in strain, and muscle pain in the neck and shoulders can occur. 2. Dizziness and headache: pressure on blood vessels in the neck causes insufficient blood supply to the brain, resulting in dizziness, headache and other symptoms. 3. Numbness of limbs: If the cervical disc herniation compresses the nerves, there will be numbness of limbs and radiating pain of limbs and other symptoms. 4. Nausea and vomiting: Sympathetic neuropathy in the neck, the front edge of cervical vertebrae directly presses the back wall of the esophagus causing esophageal stenosis, which results in nausea, vomiting, chest tightness, panic and other symptoms. 5. Visual impairment: straightening of the physiological curvature of the cervical vertebrae causes autonomic nerve disorders and insufficient blood supply of the vertebrobasilar artery, which triggers ischemic damage to the visual center of the occipital lobe of the brain, resulting in symptoms such as decreased visual acuity, eye distension and pain, photophobia, tearing, narrowing of the field of vision and sharp reduction in visual acuity. Straightening of the physiological curvature of the cervical spine is an imaging change, the doctor needs to combine with cervical spine X-ray or cervical spine magnetic resonance examination, etc. to make a clear diagnosis, and it is recommended to go to the orthopedic department of a regular hospital for treatment.