Herniated cervical vertebrae 3-4 segments can compress the cervical 4 nerve or spinal cord, resulting in symptoms such as shoulder and neck pain, neck stiffness, numbness of the upper limbs, and sensory and motor disorders of the limbs. 1. Compression of cervical 4 nerve: cervical disc herniation compresses cervical 4 nerve root, which can lead to pain and numbness in the shoulder, neck, scapula and other areas innervated by the nerve, and when the compression is serious, it can be manifested as weakness of the arm. In case of severe compression, arm weakness can be seen. Stiffness of the neck and limitation of movement can be seen in the examination. 2. Compression of the spinal cord: the probability of cervical disc herniation compressing the spinal cord is relatively small, when the spinal cord is compressed, it can show upper and lower limb movement disorder, abnormal sensation, weakened skin pain and temperature sensation, and even paralysis. If you are diagnosed with cervical vertebrae 3~4 herniation, it is recommended to carry out standardized treatment as early as possible to reduce the adverse effects of the disease.