Cervical Spine Herniated Disc Overview
A herniated disc (cervical spine) is a common condition that can lead to a considerable amount of neck, shoulder, arm and hand pain. The most common symptom, is neck pain in the back of the neck.
What is a Disc Injury?
To understand the cervical spine is to understand the anatomy of the cervical spine. Discs, which are sandwiched between the vertebrae, act as the spine’s protective shock absorbers. In essence, they are like a jelly-filled donut that contains the annulus (the outside of the donut) that surrounds the nucleus pulposus (the gel-like substance within the donut). The annulus is made up of about 30 layers that act just like the plies of a tire. If some of these plies break or tear, just like taking a cap off a toothpaste tube and squeezing the tube, the gel-like substance inside can squeeze out. This extrusion of jelly is the actual herniated disc which leads to neck pain. Causes of a herniated disc (which people sometimes call a pinched nerve in the neck) are often the wear and tear and degeneration of the discs that reside in the spine.
This herniated disc material can ultimately put pressure on nerve roots which live right next to the disc and occasionally on the spinal cord itself. In addition, the substance that makes up this gel (the nucleus) also contains substances that are toxic to nerves. Why God or Mother Nature designed the disc this way is anybody’s guess. This toxic substance can cause inflammation within the nerve, which can lead to arm pain and numbness even without direct compression of the nerve itself.
If the herniated disc (cervical spine) compresses a nerve root, pain from nerve compression will normally develop down the arm into the shoulder or to the hand (depending upon the nerve root involved). This is caused by an inflammation of the cervical spinal cord (called radiculopathy). If the herniation compresses the spinal cord it is called myelopathy and information on this condition is found in another section on this web site.
Cervical Spine Herniated Disc Symptoms
Depending upon the position of the disc herniation, cervical spine herniated disc symptoms may cause neck pain in the back of the neck, sides, in the shoulder, arm or hand. Common symptoms are pain and numbness or occasionally just weakness of the muscles of the nerve that is compressed. Depending on the nerve, pain may radiate only into the shoulder or may radiate down the arm into the fingers. Almost all cervical spine herniations radiate pain into the shoulder blade on the side of the herniation.
There are many patients that have pain that radiates only to the area between the shoulders and these symptoms are commonly misdiagnosed as thoracic or scapular (shoulder blade) pain when the pain is really referral pain from the compressed nerve in the neck. Likewise, patients may assume they have a simple pinched nerve in the neck when really it is the compression that is leading to the neck pain. Causes of these various symptoms can be revealed by an x-ray of the cervical spine region.
If present muscle weakness may not be revealed unless the individual lifts weights and is familiar with which muscles are used with different positions. Sometimes, the weakness is significant and disabling. Other times, just feeling clumsy and dropping objects can be a symptom of weakness.