Whether or not a cervical 4-5-6 segment herniated disc compressing the dural sac is serious needs to be initially determined based on the specific condition. If the compression is mild and there are no obvious symptoms, it is not too serious; if there is obvious compression and symptoms such as limb weakness, pain and numbness are more serious, timely treatment is needed. The dural sac has the role of protecting the spinal cord, if there is a cervical 4-5-6 intervertebral disc herniation compression of the dural sac, to a certain extent, the spinal cord, the nerves will be squeezed, and may show neck pain, stiffness, limb sensation, movement disorders and other symptoms. If the dural sac is mildly compressed without obvious symptoms, it is generally not too serious. It is recommended to correct the bad posture of the cervical spine in time, and at the same time pay attention to avoiding cold or trauma to the neck. If there is obvious compression, neck pain, numbness and other symptoms, is more serious. Physical therapy such as neck traction under professional guidance can be performed to improve the symptoms of nerve root compression. Medications such as ibuprofen to relieve localized pain and medications such as methylcobalamin for nutritive nerve therapy are also available. If the neurological symptoms are obvious, seriously affecting the life and the conservative treatment is ineffective, it is recommended to take surgical treatment, such as posterior cervical decompression surgery, to release the nerve compression. If the cervical 4-5-6 intervertebral disc herniation compresses the dural sac and causes obvious symptoms, it is recommended to consult a doctor in time, complete the relevant examinations, clarify the severity of the disease and then carry out the corresponding treatment under the guidance of the doctor according to the specific conditions, and do not use medication on your own.