Cervical degenerative disc disease reduces the spaces between neck vertebrae. This is because it shortens the cervical intervertebral discs, according to the University of California at Los Angeles Spine Center.
Symptoms of this condition include neck pain, stiffness and burning pain, according to UCLA. Treatments for the condition include neck bracing, physical therapy, steroid injections and fusion surgery. The goal of treatment and surgery is to reduce the stress placed on the nerve roots exiting the intervertebral space.
The University of Kansas Medical Center states that the muscles affected with reduced space at C5-C6 include the biceps and two rotator cuff muscles called the supraspinatus and the infraspinatus.