1. Head and neck movement is limited. When the eyes are closed, the head and neck rotate left and right, causing migraine or dizziness.

2. There is pain during exercise

Step 3 torticollis

4. Accompanied by abnormal pain in hands, shoulders and arms and finger weakness.

5. Migraine, visual impairment, tinnitus and hearing loss

6. People with narrow spinal canal will suddenly feel numb or get an electric shock when they bow their heads.